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The two surfaces of a biconvex lens has ...

The two surfaces of a biconvex lens has same radii of curvatures . This lens is made of glass of refractive index 1.5 and has a focal length of 10 cm in air. The lens is cut into two equal halves along a plane perpendicular to its principal axis to yield two plane - convex lenses. The two pieces are glued such that the convex surfaces touch each other. If this combination lens is immersed in water (refractive index =`4/3` ), its focal length (in cm ) is

A

5

B

10

C

20

D

40

Text Solution

Verified by Experts

The correct Answer is:
D
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