Discover Reflection Kit
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1 Instruction Manual No A Discover Reflection Kit SE-8803 Included Equipment Plane mirror with stand (15 cm x 15 cm) Corkboard (22 cm x 28 cm) Colored pins Additional Equipment Recommended Protractor Ruler or straight edge Pencil
2 Discover Reflection Kit A Introduction The Discover Reflection Kit allows students to derive the Law of Reflection and to determine the Field of Vision. To derive the Law of Reflection, students place a pin in front of the mirror. A location elsewhere in front of the mirror is chosen as the location of the eye. Light rays are drawn from the pin to the mirror and then to the eye. The process is repeated for several locations of the eye. For each reflected ray, a perpendicular line is drawn at the surface of the mirror. A protractor can then be used to prove that the angle of incidence is equal to the angle of reflection. To determine the Field of Vision, students place a pin in front of the mirror. They move their eye from left to right to determine the furthest point on each side of the mirror from which the image of the pin can be seen. Equipment Setup 1. Place a sheet of paper on the corkboard. 2. Place the mirror on top of the paper as in the picture to the right. 3. Look at one side of the mirror and locate the position where the black support meets the mirror. Place a small dot on the paper to mark this position. Repeat this step for the other side of the mirror. 4. Remove the mirror from the paper and use a ruler to connect the two dots. This line represents the position of the mirror, since this is a rear surface mirror. 5. Replace the mirror on this line, such that the mirrored surface lies along it. 2
3 A Discover Reflection Kit Suggested Activities The Law of Reflection Purpose: Students will discover the relationship between the angle of incidence and the angle of reflection. Virtual image formation will also be investigated. Note: Before the lab, it may be necessary to define "Angle of Incidence" and "Angle of Reflection." Equipment Required: Plane mirror with stand Corkboard Colored pins Protractor Straight edge Pencil Procedure: 1. Set up the apparatus as instructed in the "Equipment Setup" section. 2. Place a pin approximately 12 cm in front of the mirror and approximately 7 cm to the right of center. Label this position "A." 3. Choose a point on the left side of the mirror and label it "B." Draw an eye at this position. 4. Position your eye behind the eye at position "B" such that the image from pin "A" is in line with the eye at position "B." 5. In order to see the image of pin "A," a light ray has to leave pin "A" and reach your eye at position "B." 6. Use a straight edge or ruler to draw the path of the light ray as it leaves pin "A," reflects off the mirror, and reaches your eye at position "B." 7. Draw a dashed line perpendicular to the mirror where the ray reflects from the mirror. This is called a normal line. 3
4 Discover Reflection Kit A 8. Using a protractor, measure the angle of incidence and the angle of reflection. Enter them into Data Table Repeat steps 3-8 for 3 more positions (C, D, E) on the left side of the mirror. 10. Remove the mirror from the paper and use a straight edge to extend each of the reflected light rays behind the mirror. Use dotted lines to illustrate that the light rays from pin "A" don't actually go through the mirror. Data Table 1 Location B C D E Angle of Incidence (Degrees) Angle of Reflection (Degrees) Questions 1. Describe the relationship between the angle of incidence and the angle of reflection. 2. A 2.0 m tall woman wants to buy the shortest mirror that will allow her to view her entire body. What height should the mirror be? 3. How high on the wall must the mirror hang? Explain. 4. Describe the image of pin "A." Where is it located relative to the mirror and to the actual pin? What is its size compared to the actual pin? 5. Why does the eye "believe" that an image of the pin "A" exists behind the mirror? 4
5 A Discover Reflection Kit Field of Vision Purpose: Students will determine the field of vision for a given location in front of the mirror. Equipment required: Plane mirror with stand Corkboard Colored pins Protractor Straight edge Pencil Procedure: 1. Set up the apparatus as instructed in the "Equipment Setup" section. 2. Place a pin approximately 4 cm in front of the center of the mirror. 3. Move your eye to the left side of the mirror until the image of the pin is just at the edge of the mirror. Draw a small eye at this position. 4. Use a straight edge or ruler to draw the path of the light ray as it leaves the pin, reflects off the mirror, and reaches your eye at this position. 5. Move your eye to the right side of the mirror until the image of the pin is at the edge of the mirror. Draw a small eye at this position. 6. Use a straight edge or ruler to draw the path of the light ray as it leaves the pin, reflects off the mirror, and reaches your eye at this position. 7. Repeat steps 3-6 for pin locations 8 cm and 12 cm away from the mirror. Questions 1. Define field of vision in your own words. 2. What happens to the field of vision as an observer moves away from the mirror? 3. What determines the field of vision? 4. Sketch a top view of a car including the rear view and side view mirrors. Using your sketch, draw the field of vision for each mirror. Label the "blind spots." 5
6 A Discover Reflection Kit Safety Read the instructions before using this product. Students should be supervised by their instructors. When using this product, follow the instructions in this manual and all local safety guidelines that apply to you. Technical Support For assistance with any PASCO product, contact PASCO at: Address: PASCO scientific Foothills Blvd. Roseville, CA Phone: (916) (800) Fax: (916) Web: Limited Warranty For a description of the product warranty, see the PASCO catalog. Copyright Notice The PASCO scientific A Discover Reflection Kit Manual is copyrighted with all rights reserved. Permission is granted to non-profit educational institutions for reproduction of any part of this manual, providing the reproductions are used only in their laboratories and classrooms, and are not sold for profit. Reproduction under any other circumstances, without the written consent of PASCO scientific, is prohibited. 6
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Shadows and Solar Zenith Name Lab Partner Section Introduction: The solar zenith angle is defined to be the angle between the sun and a line that goes straight up (to the zenith) In reality the sun is