# Physics 1653 Final Exam - Review Questions

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1 Chapter 22 Reflection & Refraction Physics 1653 Final Exam - Review Questions 1. The photon energy for light of wavelength 500 nm is approximately A) 1.77 ev B) 3.10 ev C) 6.20 ev D) 2.48 ev E) 5.46 ev Ans: D 3. If the wavelength λ of the incident light is large compared with the size of the atom, the probability of elastic scattering varies as A) λ B) λ 4 C) λ 4 D) λ 2 E) λ A glass block with index of refraction 1.50 is immersed in water whose index of refraction is The critical angle at the glass water interface is A) 6.5º B) 41.9º C) 48.8º D) 56.3º E) 62.5º Ans: E 14. Light is incident on a piece of glass in air at an angle of 37.0º from the normal. If the index of refraction of the glass is 1.50, the angle that the refracted ray makes with the normal is approximately A) 8.6º B) 21.8º C) 23.6º D) 41.8º E) 56.4º 15. Which of the following statements is true about the speeds of the various colors of light in glass? A) All colors of light have the same speed in glass. B) Violet has the highest speed, red the lowest. C) Red has the highest speed, violet the lowest. D) Green has the highest speed, red and violet the lowest. E) Red and violet have the highest speed, green the lowest. Review Final Exam

2 16. A light wave traveling at speed v 1 in medium 1 passes into medium 2 where its speed is v 2. By which of the following equations is the frequency f 1 of the wave in medium 1 related to its frequency f 2 in medium 2? (θ 1 and θ 2 are the angles of incidence and refraction.) A) f 1 sin θ 1 = f 2 sin θ 2 D) f 1 v 1 = f 2 v 2 B) f 1 v 2 = f 2 v 1 E) f 1 sin θ 2 = f 2 sin θ 1 C) f 1 = f Light that has been traveling in a medium with an index of refraction n 2 is incident on the boundary surface of another medium with an index of refraction n 1. Given a sufficient angle of incidence, which of the following conditions must be satisfied for total internal reflection to occur? A) n 1 < n 2 D) Any of these may be correct. B) n 1 > n 2 E) None of these is correct. C) n 1 = n 2 Ans: A 18. From directly above, you're watching a fish swim 1.83 m beneath the surface of a clear lake (n = 1.33). How far beneath the surface does the fish seem to be? A) m B) 1.37 m C) 1.83 m D) 2.44 m E) 2.93 m Ans: B 20. A ray of light passes from air into water, striking the surface of the water with an angle of incidence of 45º. Which of the following four quantities change as the light enters the water: (1) wavelength, (2) frequency, (3) speed of propagation, and (4) direction of propagation? A) 1 and 2 only D) 3 and 4 only B) 2, 3, and 4 only E) 1, 2, 3, and 4 C) 1, 3, and 4 only Review Final Exam

3 23. The light ray in the figure is incident on a glass-air surface. The index of refraction of the glass is The approximate critical angle for total internal reflection is A) 48º B) 35º C) 30º D) 22º E) None of these is correct. Ans: B 30. The speed of yellow sodium light in a certain liquid is m/s. With respect to air, the index of refraction of this liquid for sodium light is approximately A) 1.92 B) 1.56 C) 1.23 D) 0.64 E) 1.33 Ans: B 38. For the prism immersed in water (n = 1.33), the minimum index of refraction that will produce total reflection of the indicated ray is approximately A) 0.94 B) 1.28 C) 1.50 D) 1.65 E) 1.88 Ans: E Review Final Exam

4 47. The rays in the figure are reflected and refracted at the front and back surfaces of the glass. Which of the following is true of these rays? A) 1 = 2 = 3 = 4 B) 1 = 2; 3 = 4; but 1 3 C) 1 = 2 = 3; but 4 1 D) 1 = 4; but 2 4 E) Ans: A 48. A light wave traveling in air impinges on an amber plate at an angle of incidence of 60º. If the angle of refraction is 34º, the velocity of light in amber must be approximately A) m/s D) m/s B) m/s E) m/s C) m/s Ans: D 74. In any wave motion, dependence of velocity on wavelength is called A) polarization B) deviation C) dispersion D) diffraction E) scattering Review Final Exam

5 80. Light is circularly polarized if A) the cross section of a spherical wave front is polarized. B) it consists of two plane-polarized waves that are out of phase with each other by 90º. C) it is refracted by a medium that has a high index of refraction. D) it is reflected at the critical angle and polarized. E) it is polarized by scattering from molecules. Ans: B 87. Sound waves differ from light waves in many respects. One important difference is that sound waves cannot A) be refracted. D) show diffraction. B) be reflected. E) be polarized. C) show interference. Ans: E 90. When light is reflected from a plane surface of glass at the polarizing angle (Brewster s angle), the A) reflected ray is at right angles to the incident ray. B) angle of reflection is equal to the angle of refraction. C) incident ray is at right angles to the refracted ray. D) reflected ray is at right angles to the refracted ray. E) intensity of the reflected light is a maximum. Ans: D 92. A ray of light is shown being reflected at the surface of a material. If the reflected ray is completely plane polarized, the index of refraction of the material is approximately A) 1.3 B) 1.9 C) 0.63 D) 0.80 E) 1.8 Ans: B Review Final Exam

6 Lenses and Mirrors 3. An object is placed between two mirrors set at an angle to each other. The location of the image of the object in mirror 1 is shown in the figure. The location of the image of that image in mirror 2 is at A) 1 B) 2 C) 3 D) 4 E) 5 6. A concave spherical mirror has a radius of curvature of 50 cm. The image of an object located 35 cm in front of the mirror is A) real, inverted, magnified 2.5 times, and 87.5 cm from the mirror. B) real, erect, magnified 2.5 times, and 87.5 cm from the mirror. C) virtual, erect, magnified 3.3 times, and 117 cm from the mirror. D) real, inverted, magnified 3.3 times, and 117 cm from the mirror. E) real, inverted, diminished 0.42 times, and 14.6 cm from the mirror. Ans: A 7. An object 25 cm from a convex mirror is observed to produce an image 13.6 cm behind the mirror. What is the focal length of the mirror? A) 8.8 cm B) 8.8 cm C) 30 cm D) 30 cm E) 60 cm Ans: D 12. When an object is farther from a concave mirror than twice the mirror's focal length, the A) magnification is less than one. B) image is inverted. C) image distance is less than the object distance. D) image is real. E) All of these are correct. Ans: E Review Final Exam

7 14. A concave spherical mirror can produce which one of the following types of images? A) virtual, inverted, and magnified D) magnified, erect, and virtual B) real, erect, and magnified E) diminished, real, and erect C) diminished, erect, and virtual Ans: D 17. The image of an object, placed in front of a spherical convex mirror as shown, forms between A) O and V and is magnified. D) F and C and is diminished. B) V and F and is magnified. E) F and C and is magnified. C) V and F and is diminished. 21. An object is placed between 2f and infinity in front of a concave mirror of focal length f. The image is located A) behind the mirror, between 2f and the mirror. B) behind the mirror, between 2f and infinity. C) in front of the mirror, between the mirror and f. D) in front of the mirror, between f and the center of curvature. E) in front of the mirror, between the center of curvature and infinity. Ans: D 24. An object is placed 4.24 cm in front of a concave mirror that has a radius of curvature of 20.3 cm. The image is located A) 12.1 cm in front of the mirror. D) 16.9 cm behind the mirror. B) 12.1 cm behind the mirror. E) 16.9 cm in front of the mirror. C) 7.26 cm behind the mirror. Review Final Exam

8 26. Two parallel mirrors are a distance d apart. An object is placed 1.0 inch in front of the right-hand mirror. After 5 reflections, with the first reflection from the right-hand mirror, an image is located 17 inches behind the right-hand mirror. Calculate the distance between the mirrors. A) 5.3 in B) 3.2 in C) 6.0 in D) 4.0 in E) 3.6 in Ans: D 28. A circular coin is 33.3 cm from a concave spherical mirror. (Assume the coin is on the optical axis.) The image of the coin is produced 10.0 cm from the mirror and on the same side as its real position. If the coin is moved to a position 23.3 cm from the mirror, then calculate how far from the mirror the new image is. A) 13.7 cm B) 10.0 cm C) 15.1 cm D) 8.35 cm E) 11.5 cm Ans: E 40. A real object is 42.1 cm from a negative lens that has a focal length of 25.6 cm. The object is 2.45 mm high. The height and orientation of the image are A) 3.8 mm and inverted. D) 0.38 mm and erect. B) 0.93 mm and erect. E) None of these is correct. C) 6.4 mm and erect. Ans: B 41. An object 2 cm high is placed 20 cm from a thin convex lens that has a focal length of 10 cm. Which of the following statements describes the image formed? A) It is 2 cm high. D) It is real. B) It is 20 cm from the lens. E) All of these are correct. C) It is inverted. Ans: E 42. A real object is 30 cm from a negative lens that has a focal length f = 20 cm. The image is A) virtual and 30 cm from the lens. D) real and 20 cm from the lens. B) real and 12 cm from the lens. E) None of these is correct. C) virtual and 12 cm from the lens. Review Final Exam

9 44. A lens forms an erect image of a real object. The image is twice the size of the object and appears to be 40 cm from the lens. Determine the power of the lens in diopters (D). A) There is not sufficient information. D) +7.5 D B) 2.5 D E) None of these is correct. C) +2.5 D 45. A negative lens with a focal length of 10.0 cm is on the same axis as a positive lens with a focal length of cm as illustrated. The distance between the lenses is 20.0 cm. A real object 3.00 cm high is placed 20.0 cm to the left of the negative lens. After the light has passed through both lenses, the image is A) 3.0 cm high and virtual. D) 3.0 cm high and real. B) 1.0 cm high and virtual. E) None of these is correct. C) 1.0 cm high and real. Ans: D 46. Two lenses, one with a focal length f 1 = +20 cm and the other with a focal length f 2 = 20 cm, are on the same axis and 60 cm apart as shown. A real object is 40 cm to the left of the positive lens. The image formed by the negative lens is A) real and 10 cm from the negative lens. B) virtual and 10 cm from the negative lens. C) at infinity. D) virtual and 20 cm from the negative lens. E) None of these is correct. Ans: B Review Final Exam

10 47. A negative lens with a focal length of 15 cm is 25 cm from a positive lens with a focal length of +20 cm on the same asix. Parallel light from the left is incident on the negative lens. The image formed by the positive lens is A) real and 40 cm from the positive lens. B) virtual and 20 cm from the positive lens. C) real and 20 cm from the positive lens. D) real and 13 cm from the positive lens. E) None of these is correct. Ans: A 51. A positive lens of focal length 40 cm is placed 20 cm behind a negative lens of focal length 80 cm. An object is placed 240 cm in front of the negative lens. The final image distance relative to the positive lens is A) 40 cm B) 56 cm C) 56 cm D) 80 cm E) 80 cm Ans: D 53. An object placed 4 cm to the left of a positive lens of focal length 2 cm produces an image 4 cm to the right of the lens. A negative lens placed at the focal point of the positive lens as shown produces a final image 6 cm to the right of the negative lens. The negative lens has a focal length of A) 1.5 cm B) 3.0 cm C) 6.0 cm D) 10 cm E) 2.0 cm Ans: B Review Final Exam

11 60. The objective of a certain lens system is a double-convex lens of 10.2 cm focal length; the eyepiece is a lens of 15.2 cm focal length and is placed 25.4 cm behind the objective. When an object is 30.5 cm in front of the objective, how far is the image from the eyepiece? A) 44.2 cm B) 30.5 cm C) 5.08 cm D) 22.1 cm E) 61.0 cm Ans: B 67. A concave-convex lens of flint glass has radii of 12 cm and 10 cm, respectively, and an index of refraction of The focal length of this lens is A) 100 cm B) 100 cm C) 9.1 cm D) 9.1 cm E) 14.5 cm Ans: A 74. A ray of light leaves point O and passes through a thin positive lens. It crosses the principal axis at point A) 1 B) 2 C) 3 D) 4 E) The figure shows a doublet lens in which the positive lens and the negative lens are both manufactured from flint glass and have the same radius of curvature. The focal length of the negative lens is 50.8 cm, and the focal length of the positive lens is 50.8 cm. The combined focal length of the doublet is A) 25.4 cm B) 25.4 cm C) 102 cm D) 102 cm E) infinite. Ans: E Review Final Exam

12 85. A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm. If the image distance is +50 cm, then find the image height of the candle and whether it is upright or inverted. A) 4.0 cm upright D) 4.0 cm inverted B) 3.3 cm upright E) None of these is correct. C) 3.3 cm inverted Ans: D 87. An object is placed to the left of a thin converging lens with a focal length of 8 cm. A real and inverted image is formed 13.3 cm to the right of the lens. What is the distance of the object from the lens? A) 20.1 cm B) 13.3 cm C) 5.00 cm D) 0.20 cm E) 21.3 cm Ans: A 129. A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the position of the final image relative to the eyepiece lens. A) 27.7 cm B) 50.7 cm C) 15.0 cm D) 1.59 cm E) 35.3 cm Ans: B Review Final Exam

13 1. Complete the following sentence: The term coherence relates to (a) the phase relationship between two waves. (b) the polarization state of two waves. (c) the diffraction of two waves. (d) the amplitude of two waves. (e) the frequency of two waves. 5. A double slit is illuminated with monochromatic light of wavelength nm. The m = 0 and m = 1 bright fringes are separated by 3.0 cm on a screen which is located 4.0 m from the slits. What is the separation between the slits? (a) m (c) m (e) m (b) m (d) m 6. What does one observe on the screen in a Young s experiment if white light illuminates the double slit instead of light of a single wavelength? (a) a white central fringe and no other fringes (b) a dark central fringe and a series of alternating white and dark fringes on each side of the center (c) a white central fringe and a series of colored and dark fringes on each side of the center (d) a continuous band of colors with no dark fringes anywhere (e) a dark screen since no constructive interference can occur Review Final Exam

14 7. In two separate double slit experiments, an interference pattern is observed on a screen. In the first experiment, violet light (λ = 754 nm) is used and a second-order bright fringe occurs at the same location as a fourth-order dark fringe in the second experiment. Determine the wavelength of the light used in the second experiment. (a) 1320 nm (c) 594 nm (e) 388 nm (b) 862 nm (d) 431 nm 10. In a Young's double slit experiment, the separation between the slits is m; and the screen is located 3.50 m from the slits. The distance between the central bright fringe and the second-order bright fringe is m. What is the wavelength of the light used in this experiment? (a) 428 nm (c) 517 nm (e) 711 nm (b) 474 nm (d) 642 nm 21. A nm thick film of kerosene (n = 1.2) is floating on water. White light is normally incident on the film. What is the visible wavelength in air that has a maximum intensity after the light is reflected? Note: the visible wavelength range is 380 nm to 750 nm. (a) 380 nm (c) 480 nm (e) 580 nm (b) 430 nm (d) 530 nm 22. A portion of a soap bubble appears green (λ = nm in vacuum) when viewed at normal incidence in white light. Determine the two smallest, non-zero thickness for the soap film if its index of refraction is (a) 89 nm and 179 nm (c) 125 nm and 250 nm (e) 170 nm and 536 nm (b) 89 nm and 268 nm (d) 125 nm and 375 nm. Review Final Exam

15 25. Light of wavelength 650 nm is incident normally upon a glass plate. The glass plate rests on top of a second plate so that they touch at one end and are separated by mm at the other end as shown in the figure. What is the horizontal separation between two adjacent bright fringes? (a) 1.2 mm (c) 3.5 mm (e) 6.3 mm (b) 2.1 mm (d) 4.9 mm 26. A transparent film (n = 1.4) is deposited on a glass lens (n = 1.5) to form a nonreflective coating. What thickness would prevent reflection of light with wavelength nm in air? (a) 89 nm (c) 170 nm (e) 357 nm (b) 125 nm (d) 250 nm 27. A lens that has an index of refraction of 1.61 is coated with a non-reflective coating that has an index of refraction of Determine the minimum thickness for the film if it is to be nonreflecting for light of wavelength nm. (a) m (c) m (e) m (b) m (d) m Review Final Exam

16 30. Monochromatic light of wavelength λ film is normally incident on a soap film in air. In terms of the wavelength, what is the thickness of the thinnest film for which the reflected light will be a maximum? (a) λ film /4 (c) 3 λ film /4 (e) 3 λ film /2 (b) λ film /2 (d) λ film 33. Light of wavelength nm passes through a diffraction grating. The m = 0 and m = 1 bright spots are 6.0 cm apart on a screen positioned 2.0 cm from the grating. What is the spacing between the slits in the grating? (a) 233 nm (c) 467 nm (e) 1240 nm (b) 420 nm (d) 738 nm 34. Light of wavelength 625 nm shines through a single slit of width mm and forms a diffraction pattern on a flat screen located 8.00 m away. Determine the distance between the middle of the central bright fringe and the first dark fringe. (a) cm (c) 1.56 cm (e) 6.51 cm (b) cm (d) 5.16 cm 35. Light of nm is incident on a single slit of width 6.5 µm. The resulting diffraction pattern is observed on a nearby screen and has a central maximum of width 3.5 m. What is the distance between the screen and the slit? (a) 9.5 m (c) 38 m (e) 76 m (b) 19 m (d) 57 m Review Final Exam

17 Diffraction Grating 50. A 30.0-mm wide diffraction grating produces a deviation of 30.0 in the second order principal maxima. The wavelength of light is nm. What is the total number of slits on the grating? (a) (c) (e) (b) (d) A beam of light that consists of a mixture of red light (λ = 660 nm in vacuum) and violet light (λ = 410 nm in vacuum) falls on a grating that contains lines/cm. Find the angular separation between the first-order maxima of the two wavelengths if the experiment takes place in a vacuum. (a) 11 (c) 24 (e) 65 (b) 17 (d) Red light of wavelength nm is incident on a grating. If the separation between the slits is m, at what angle does the first principal maximum occur? (a) rad (c) rad (e) rad (b) rad (d) rad 53. A diffraction grating that has 4500 lines/cm is illuminated by light that has a single wavelength. If a second order maximum is observed at an angle of 42 with respect to the central maximum, what is the wavelength of this light? (a) 1500 nm (c) 930 nm (e) 740 nm (b) 370 nm (d) 1100 nm Review Final Exam

18 56. Visible light of wavelength 589 nm is incident on a diffraction grating that has 3500 lines/cm. At what angle with respect to the central maximum is the fifth order maximum observed? (a) 17.9 (c) 35.7 (e) A fifth order maximum (b) 23.8 (d) 71.3 cannot be observed. 57. White light is passed through a diffraction grating that has lines/m. On each side of the white central maximum, a spectrum of colors is observed. What is the wavelength of the light observed at an angle of 7.00 in the first-order bright fringes? (a) 487 nm (c) 632 nm (e) 731 nm (b) 589 nm (d) 668 nm Review Final Exam

19 Chapter 25 The Human Eye The following questions are related to the eye that we didn t cover. You can treat these problems like regular lens questions but you need two pieces of information. The focal length of the relaxed eye is 2.5cm, that is, an object at infinity (parallel light rays) will be focused on the back of the eyeball (the retina). The near point, X np, is 25cm. This is the smallest object distance for which the eye can focus comfortably. 92. For a myopic eye that cannot focus on objects more than 25 cm in front of it, the power in diopters of the lens needed for distinct distant vision is A) +25 diopters D) 2.5 diopters B) +4.0 diopters E) None of these is correct. C) 4.0 diopters 95. Your hypermetropic eye cannot focus on objects that are closer than 225 cm from it. The power in diopters of the lens you need for distinct distant vision is A) diopters D) 0.44 diopters B) diopters E) None of these is correct. C) +3.6 diopters 103. Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes. What power lenses are required for her to see distant students clearly? A) 1.5 B) 0.15 C) 0.67 D) 0.67 E) 1.5 Ans: D Review Final Exam

20 56. When a human eye that has a power of +60 D is fitted with a contact lens of 10 D, the equivalent lens combination is A) diverging and of focal length 2 cm. D) focal length 0.02 cm. B) converging and of focal length 50 cm. E) focal length 0.2 cm. C) converging and of focal length 2 cm. Review Final Exam

21 The Microscope These are optical instrument problems that we don t cover in this course. The microscope problems are just two lens ray tracing problems but the distance between the lens and where the object is placed are specific to the microscope. The focal points can t overlap and the object is placed very close to, but outside the objective lens focal point A person uses two microscopes to view the same object. Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B. If microscope A provides a magnification of m, then what magnification does B provide? (Assumes that the inter-lens spacing L is such that L A = 2L B.) - HARD A) m B) 2m C) m/2 D) 8m E) m/8 Ans: E 116. You have two lenses for making a compound microscope: f o = cm and f e = 1.20 cm. How far apart should you set the the lenses to get a magnification of 300? (Assume the normal near point of 25.0 cm.) A) 11.5 cm B) 12.7 cm C) 13.5 cm D) 13.9 cm E) 15.0 cm Review Final Exam

22 The Telescope These are optical instrument (telescope) problems that we don t cover in this course. The telescope problems are just two lens ray tracing problems but the distance between the lens and the object location are specific to the telescope. The focal length distance determine the length of the telescope and the object is located very far from the objective lens A simple refracting telescope has an objective of focal length 75 cm and an eyepiece of focal length 3.0 cm. When viewed by the naked eye, the moon subtends an angle of about radians. What angle is subtended by the moon when it is viewed through this telescope? A) rad D) rad B) 0.22 rad E) rad C) rad Ans: B 121. The 200-in reflecting telescope at Mt. Palomar has an objective mirror with a focal length of 16.8 m. If you use an eyepiece with a focal length of 2.00 cm, what is the overall magnification of this telescope? A) 250 B) 130 C) 840 D) 38 E) 300 Review Final Exam

24 48. The wavelength of light emitted from two distant objects is 715 nm. What is the minimum angle at which these objects can just be resolved when using binoculars with a 50-mm objective lens? (a) 10 2 degrees (c) 10 4 degrees (e) 10 6 degrees (b) 10 3 degrees (d) 10 5 degrees 49. Two candles are lit and separated by 0.10 m. If the diameter of the pupil of an observer s eye is 3.5 mm, what is the maximum distance that the candles can be away from the observer and be seen as two light sources? Use 545 nm for the wavelength of light in the eye. (a) 170 m (c) 530 m (e) 850 m (b) 340 m (d) 680 m Review Final Exam

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