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A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is
A. R/2
B. R
C. 2R
D. 1.5R

1 Answer

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Correct Answer - C
(c ) Focal length of plano- convex lens,
`f=R/(µ-1)=R/((15-1))=2R`

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