The figure below shows a thin plano-convex lens of refractive index `mu_(1)` and a thin plano-concave lens of refractive index `mu_(2)`, both having same radius of curvature R of their curved surfaces. Another thin lens of refractive index `mu_(3)` has same radius of curvature R on the two surface between the plano-convex and plano-concae lenses that the plane surfaces are parallel to each other. Find the focal length of the combination.

The adjacent figure shows a thin plano-convex lens of refractive index mu_1 and a thin plano-concave lens of refractive index mu_2 , both having same radius of curvature R of their curved surfaces. The thin lens of refractive index mu_3 has radius of curvature R of both its surfaces. This lens is so placed in between the plano-convex and plano-concave lenses that the plane surfaces are parallel to each other. The focal length of the combination is

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

Curved surfaces of a plano-convex lens of refractive index mu_(1) and a plano-concave lens of refractive index mu_(2) have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.

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-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

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 ?