1.

The radius of curvature of convex surface of a thin plano-convex lens is 15 cm and refractive index of its material is 1.6. The power of the lens will be                    [MP PMT 1994]

A.            \[+1\,D\]                               
B.            \[-2\,D\]
C.            \[+\,3\,D\]                            
D.            \[+\,4\,D\]
Answer» E.


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