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Rays of light from Sun falls on a biconv...

Rays of light from Sun falls on a biconvex lens of focal length f and the circular image of Sun of radius r is formed on the focal plane of the lens. Then

A

Area of image `pir^(2)`directly proportional to `f`

B

Area of image `pir^(2)`directly proportional to `f^(2)`

C

Intensity of image increases if `f ` is increased

D

if flower hall of the lens is covered with black paper area of image will become halg.

Text Solution

Verified by Experts

The correct Answer is:
B

`r=ftanalpha`
`Hencepir^(2)propf^(2)`
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