A convex lens of focal length `12 cm` is made of glass of `mu=(3)/(2)`. What will be its focal length when immersed in liquid of `mu=(5)/(4)` ?

A thin lens of focal length + 12 cm is immersed in water (mu = 1.33). What is its new focal length ?

A thin lens of focal length + 12 cm is immersed in water (mu = 1.33). What is its new focal length ?

A thin lens of focal length + 12 cm is immersed in water (mu = 1.33). What is its new focal length ?

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?

A convex lens of focal length 20 cm and made of glass (mu = 1.5) is immersed in water of mu = 1.33 Calculate change in focal length of the lens.