A full-length plane mirror is mounted on the outside of a closet. When you stand

Question

A full-length plane mirror is mounted on the outside of a closet. When you stand in front of the mirror, outside the closet, you see an upright virtual image of yourself, as shown in the diagram. If a convex lens is now placed behind the mirror, inside the closet, halfway between the mirror and the position of the original image, what do you observe about the position of your image when you look at the plane mirror? [] Your image moves closer to you [] your image is unchanged [] your image moves farther away from you [] Not enough information is given to determine this. (b) Justify your answer: (c) When an object is placed 12 cm in front of a particular optical device (either a single mirror or a single lens) a virtual image is formed 24 cm from the device on the same side of the device as the object. What kind of mirror or lens could this optical device be? Select all that apply. [] a plane mirror [] a convex (diverging) mirror [] a diverging lens [] a converging lens (d) Describe how you arrive at the above answer. (e) Find the focal length of the optical device. (f) On the diagram above, sketch a ray diagram for this situation. Make use of points on the page, not off the page.

Explanation / Answer

problem 1.

image will not change because light rays will not go through the convex lens.

problem 2.

convex lens.

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