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Question

A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distance object (preferably the sun) should be focussed on the screen. What should be done for this purpose?


A

Move the screen and the mirror away form the object

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B

Move the mirror slightly towards the screen

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C

Move the screen and the mirror towards the object

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D

Move the screen slightly away from the mirror

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Solution

The correct option is D

Move the screen slightly away from the mirror


When an object is between centre of curvature and infinity, image is formed between C and F. Sun can be considered at infinity. So, its image is formed at the focus of a concave mirror.


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