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2015-03-10T19:01:18+05:30

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Mirror and screen is 20 cm 
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2015-03-10T23:18:36+05:30

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When the image of a very distant object is formed using a concave mirror, image is formed at the focus. So the screen is at a distance of 20cm from the mirror. 20cm is also the focal length of the mirror.
So option is C.
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