nettaboo8316 nettaboo8316

26-04-2024
Physics

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

A) πr²∝f
B) πr²∝f²
C) If lower half part is convered by black sheet, then area of the image is equal to πr²/2
D) If f is doubled, intensity will increase

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