In the figure, an air lens of radii of curvature 10 cm R1=R2=10 cm is cut in a cylinder of glass μ=1.5.The focal length and the nature of the lens is

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15 cm, concave

15 cm, convex

∞, neither concave nor convex

0, concave

answer is A.

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Detailed Solution

1f= gμa−11R1−1R2=23−1210⇒f=−15cm, so behaves as concave lens.

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