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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

`pir_2propf`

B

`pir^2propf^2`

C

if lower half part is covered by black sheet, then area of the image is equal to `(pir^2)/(2)`

D

if f is doubled intensity will increase

Text Solution

Verified by Experts

The correct Answer is:
B

`r=ftheta`
`pir^2propf^2`
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