A convex lens of focal length 0.2 m and made of glass `9mu=1.50)` is immersed in water `9mu=1.33)`.Find the chajnge in the focal length of the lens.

What happens to be focal length of convex lens when it is immersed in water?

A convex lens of refrative index 1.5 is immersed in a liquid of refractive index: 1.5. what changes happen to the focal length of the lens in the three cases?

A thin converging lens has a focal length f in air. If it is completely immersed in a liquid , briefly explain how the focal length of the lens will vary?

A concave mirror of focal length f ( in air ) is immersed in water (mu=4//3) .The focal length of the mirror in water will be

A convex lens of focal lenth 30 cm and a concave lens of focal length 60 cm are placed in contact.Find the power of the combination.

A glass (mu=1.5) convex lens of focl length 40 cm is placed in water (mu=1.3) .What will be its new focal length?

Find the power of a concave lens of focal length 2 meters?