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Image Formation by Spherical Mirrors

To determine ...

Question

To determine focal length of a concave mirror a student obtains the image of a well lit distant object on a screen. To determine the focal length of the given concave mirror he needs to measure the distance between:

A

Cannot be determined

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B

Mirror and the screen

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C

Mirror and the object

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D

Screen and the object

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Solution

The correct option is B
Mirror and the screen

The distance between mirror and the screen will give the focal length of the mirror as the mirror focuses the light on the screen.

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