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Greatest thickness of a plano convex gla...

Greatest thickness of a plano convex glass lens appear to be 2 cm when observed normally through the plane surface and when observed through the curved face, the greatest thickness is `20//9` cm. If the real thickness be 3 cm, what is the radius of curvature of the spherical surface ?

A

20 cm

B

10 cm

C

5 cm

D

2.5 cm.

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