A biconvex lens of focal length f forms a circular image of sun of radius r...
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A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then (A) r oc f (B) x (C) if lower half part is covered by black sheet, then area of the image is equal to tr/2 (D) if f is doubled, intensity will increase A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then (A) r oc f (B) x (C) if lower half part is covered by black sheet, then area of the image is equal to tr/2 (D) if f is doubled, intensity will increase
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