A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then (A) ?r2 œ f (B) ?r2 œ f2 (C) if lower half part is covered by black sheet, then area of the image is equal to ?r2/2 (D) if f is doubles, intensity will increase please clearify!!!!!! A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then (A) ?r2 œ f (B) ?r2 œ f2 (C) if lower half part is covered by black sheet, then area of the image is equal to ?r2/2 (D) if f is doubles, intensity will increase A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then (A) ?r2 œ f (B) ?r2 œ f2 (C) if lower half part is covered by black sheet, then area of the image is equal to ?r2/2 (D) if f is doubles, intensity will increase A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then (A) ?r2 œ f (B) ?r2 œ f2 (C) if lower half part is covered by black sheet, then area of the image is equal to ?r2/2 (D) if f is doubles, intensity will increase

Rahbar Ahmad , 16 Years ago

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