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A mirror produces on a screen an image o...

A mirror produces on a screen an image of the sun `2cm` in diameter. If the sun's disc subtends an angle `0.1` radian on the surface of the earth, then the radius of curvature of the mirror is

A

`20cm`

B

`40cm`

C

`200cm`

D

`400cm`

Text Solution

Verified by Experts

The correct Answer is:
B
Since the image is real, it is a concave mirror

`theta=(arc)/(radius)=(2)/(f)=0.1rad`
`implies f=20cm` and `R=2f=40cm`
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