A planoconvex lens is made of refractive index 1.6. The radius of curvature of curved surface is 60 cm. The focal length of the lens is

A planoconvex lens is made of refractive index 1.6. The radius of curv

1.	A planoconvex lens is made of refractive index 1.6. The radius of curvature of curved surface is 60 cm. The focal length of the lens is
Answer» 50 cm 100 cm 200 cm 400 cm Solution :As `n=1.6, R_(1)=+60 cm and R_(2)=oo`, hence `(1)/(f)=(n-1)((1)/(R_(1))-(1)/(R_(2)))=(1.6-1)[(1)/(60)-(1)/(oo)]=(0.6)/(60)=(1)/(100)=f=+100cm`

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A planoconvex lens is made of refractive index 1.6. The radius of curvature of curved surface is 60 cm. The focal length of the lens is

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