focal length double convex glass `(u_g = 1.5)` lens of radii of curvatures 20 cm each immersed in air is
`(u_a = 1)`

Focal length of a double convex glass (u_g = 1.5) lens of radii of curvatures 20 cm each immersed in water, (mu_w = 1.35)

A double convex glass (u_g = 1.5) lens of radii of curvatures 20 cm each immersed in carbno disulphide, (mucs_2 = 1.65) .Find the focal length.

The focal length of a bi-convex glass (mu_g = 1.5) in air is 20 cm. Find its focal lengths in water (mu_w = 1.35) and in carbon di-suphide (mu_(cs) = 1.65).

The focal length of a biconvex glass (mu_g = 1.5) lens in air (mu_alpha = 1) is + 20 cm . Then the focal length of this glass lens in water (mu_omega = 1.33) is

Light from a point source in air falls on a spherical glass surface (n = 1.5) of radius of curvature 20 cm. The distance of the light source form the glass surface is 100 cm. Find the position of the image.