A plano-convex lens `mu = 1.5` has focal length of 18 cm in air. Calculate the radius of curvature of the spherical surface.

A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index (4)/(3) .

A convex glass lens (mu_(g) = 1.5) has a focal length of 8 cm when placed in air. What is the focal length of the lens when it is immersed in water ? (mu_(omega) = (4)/(3))

A plano-convex lens has focal length of 20 cm. the radius of its spherical suface is (""_(a) mu_(g)=1.5)

A plano-convex lens (focal length f_2 , refractive index mu_(2) , radius of curvature R) fits exactly into a plano-concave lens (focal length f_(1) refractive index mu_1 , radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be :

The refractive index and the focal length of a plano convex lens are 1.5 and 50 cm respectively. What is the radius of curvature of the curved surface ?

A plano-convex lens is made of glass of refractive index 1.6. the radius of curvature of its curved surface is 30 cm. What is the focal length of the lens ?