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In figure, an air lens of radius of curv...

In figure, an air lens of radius of curvature of each surface equal to `10 cm` is cut into a cylinder of glass of refractive index `1.5.` The focal length and the nature of lens are

A

15 cm, concave

B

15 cm, convex

C

`oo`, neither concave nor convex

D

0, concave

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The correct Answer is:
a
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