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Question

The radius of curvature of a concave mirror is 10 cm. If I want to capture the image of the sun, at what distance from the pole of the mirror would an image be formed?


A

10 cm

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B

5 cm

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C
At infinity
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D

20 cm

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Solution

The correct option is B

5 cm


Given, Radius of curvature =10 cm
If the object is placed at infinity the image is formed at the focus.

We know the focal length(F) is half the radius of curvature(R).
F=R2
F=102
F= 5 cm

So the image of the sun is at 5 cm from the pole.


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