6. (10 points) You hold a hand mirror 0.5 m in front of you and look a reflectio

Question

6. (10 points) You hold a hand mirror 0.5 m in front of you and look a reflection in a full-length minnor I m behind you. How far in back of the big minnon do you see the image of your face? a) 0.5 m b) 1.0 m c) 1.5m d) 2.0 m e) 2.5 m 7. (10 points) An object is placed 15.0 em to the left of a double-convex lens of focal length 20.0 em. The image of this object is located? (show all 3 prineipal rays) A) 60.0 em to the right of the lens B) 60.0 cm to the left of the lens. C) 857cm to the right ofthe lens. D) 8.57 cm to the left of the lens. E) 30.0 cm to the left of the lens š. (10 points) Suppose you wanted to start a fire using sunlight and a mirror. Which of the following statements is most accurate? A) It would be best to use a plane mirror. B) It would be best to use a convex mirror. t to use a concave mirror, with the object to be ignited positioned at the center of curvature of It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirro One cannot start a fire using a mirror, since mirrors form only virtual images. the mirror D) and its center of curvature. E)

Explanation / Answer

6)

here,

the image formed in the front mirror , I1 = 0.5 m

the image formed in the back mirror , I2 = 1 m + 0.5 m + I1

I2 = 1 m + 0.5 m + 0.5 m

I2 = 2 m

so the image formed in the seccond mirror is d) 2 m

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