A convex lens of refractive index 1.5 has a focal length of 20 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index 4/3.

A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index (4)/(3) .

A convex lens of refractive index 1.5 has a focal length of 20cm in air. Calculate the change is its focal length when immersed in water of refractive index 4/3.

A convex lens of refractive index 1.5 has a focal length of 18 cm in air.Calculate the change in focal length,when it is immersed in water of refractive index 4//3 .

A glass convex lens of refractive index 3/2 has got a focal length equal to 0.3 m. Find the focal length of the lens if it is immersed in water of refractive index 4//3 .

A biconvex lens of refractive index "1.5" has a focal length of "20cm" in air.Its focal length when immersed in a liquid of refractive index "1.6" will be:

A glass or glycerin convex lens of refractive index 3//2 has got a focal length equal to 50 cm. Find the focal length of the lens, if it is immersed in ethyl alcohol of refractive index 1.36.

A glass or glycerin convex lens of refractive index 3//2 has got a focal length equal to 50 cm. Find the focal length of the lens, if it is immersed in ethyl alcohol of refractive index 1.36.

A converging lens of refractive index 1.5 and of focal length 15 cm in air, has the same radii of curvature for both sides. If it is immersed in a liquid of refractive index 1.7 , find the focal length of the lens in the liquid.