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A lens haivng focal length and aperture ...

A lens haivng focal length and aperture of diameter d forms an image of intensity `I`. Aperture of diameter `d/2` in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively.

A

`f"and"(I)/(4)`

B

`(3f)/(4)"and"(I)/(2)`

C

`f"and"(3I)/(4)`

D

`(f)/(2)"and"(I)/(2)`

Text Solution

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The correct Answer is:
C
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