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GPII - Homework 8, Reflection - solutions

# GPII - Homework 8, Reflection - solutions - honea(cth632...

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honea (cth632) – H8Reflection – avram – (1956) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points An object is placed near a plane mirror, as shown. mirror surface Object P R F S G Which of the labeled points is the position of the image? 1. G correct 2. R 3. F 4. S 5. P Explanation: The line connecting the object and its im- age should be perpendicular to the plane of the mirror, and the perpendicular distance from the image to the mirror is the same as the perpendicular distance from the object to mirror. mirror surface Eye Object P R F S Image θ θ θ Clearly only point G is the position of the image. 002 10.0points An object, slanted at an angle of 45 , is placed in front of a vertical plane mirror, as shown. Mirror Which of the following shows the appar- ent position and orientation of the object’s image? 1. image 2. image 3. image 4. image 5. image 6. image 7. image

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honea (cth632) – H8Reflection – avram – (1956) 2 8. image correct Explanation: For a plane mirror, the line connecting a point of the object and the corresponding point of the image is perpendicular to the mirror, and corresponding distances from the points to the mirror are the same. Thus, the image should be image object 003 10.0points Consider a concave mirror with radius R . An upright object is placed between the interval R 2 and R . R R /2 The image is 1. real, inverted, enlarged. correct 2. real, upright, enlarged. 3. virtual, upright, same size. 4. virtual, upright, enlarged. 5. real, upright, reduced. 6. real, inverted, reduced. 7. real, upright, same size. 8. virtual, inverted, enlarged. 9. virtual, inverted, reduced. 10. virtual, upright, reduced. Explanation: R R /2 Note: f = R 2 , where f is positive for a concave mirror by convention. From the mirror equation 1 p + 1 q = 1 f .
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