Manipal Entrance Test 2014 Physics Paper

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Question : 40 of 60

Marks: +1, -0

A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane.
Then,

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

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