IIT JEE Advanced 2006 Paper 1

Section: Physics

Question : 4 of 120

Marks: +1, -0

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

[JEE Adv 2006 P1]

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

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