Question
Fri March 01, 2013 By:
 

A student obtained a sharp image of a frills of a window using a concave mirror. His teacher remarked that for getting better results a well lit distant object ( preferably the sun ) should be focussed on the screen. What should be done for this purpose? a) Move the screen slightly away from the mirror b) Move the screen and the mirror away from the object c) Move the screen and the mirror towards the object d) Move the mirror slightly towards the screen The answer is " d) Move the mirror slightly towards the screen " Why is it so??

Expert Reply
Fri March 01, 2013
When an object is between C &infinity, image is obtained between C&F.
Sun can be considered at infinity.So its image is formed at the focus of concave mirror.So the mirror slightly has to be moved towards the screen.
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