JEE Mains Model Paper 13

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Question : 22 of 90

Marks: +1, -0

A biconvex lens of focal length f forms a circular image of radius r of sun in focal plane. Thenwhich option is correct ?

πr2 ∝ f
πr2 ∝ f2
If lower half part is converted by black sheet, then area of the image is equal to πr2/2
If f is doubled, intensity will increase.

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