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

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

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.

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

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 ?