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Q.

A student determines the focal length of a device ‘X’ by focusing the image of a distant object on a screen as shown in the figure below.

The device X is :

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a

convex mirror

b

concave mirror

c

convex lens

d

concave lens

answer is B.

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Detailed Solution

Concave mirror acts as a converging  mirror here light rays are incident on x mirror after reflection all are converging at one point so x is a concave mirror.
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