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.

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)

The radii of curvatures of both surfaces of a double convex lens made of glass, (mu = 1.5) is R. Its focal length is

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).

Fill in the blank spaces with appropriate answers: If a convex lens of glass (mu = 1.5) is put inside carbon disulphide (mu = 1.65) then the nature of the lens changes from ____to ____.