Geometrical OpticsMedium
Question
A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then
Options
A.πr2 ∝ f
B.πr2 ∝ f2
C.if lower half part is covered 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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