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Q.

Uses of concave mirror are


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a

In solar furnaces

b

In shaving mirror

c

Head mirrors

d

All of the above 

answer is D.

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Detailed Solution

The correct option is 4.
It is known that concave mirrors are converging mirrors as they converge all the light rays to a single point. Also, they form an enlarged image of the object. Therefore, they are used as shaving mirrors, doctors use them as head mirrors, and we use them in solar furnaces because they converge the parallel sun rays at a point. This helps in raising the furnace's temperature.
 
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