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Diameter of a plano - convex lens is 6 cm and its thickness at the centre is 3 mm. Then the focal length of the lens, if the speed of light in the material of lens is 2×108 m/ s

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An Intiative by Sri Chaitanya

a

7.5 cm

b

15 cm

c

45 cm

d

30 cm

answer is D.

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Detailed Solution

μ=CoCm; R2=y2+R-t2=(2R-t)t=y22Rt-t2=y2⇒t<

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