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 isA. R/2B. RC. 2 RD. 1.5 R

A plano convex lens is made of glass of refractive index 1.5. The radi

1.	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 isA. R/2B. RC. 2 RD. 1.5 R
Answer» Correct Answer - C Focal length of plano-convex lens, `f=(R )/(mu-1)=(R )/((1.5-1))=2R`

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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 isA. R/2B. RC. 2 RD. 1.5 R

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