A double convex lens of focal length 20 cm is made of glass of refractive index 3 / 2. When placed completely in water `(._(a)mu_(w)=4//3)`, its focal length will be

Convex lens of focal length 15 cm is made of material having refractive index 1.2. When placed in water (n = 1.3) , it will behave as :

A convex lens of focal length 0.15 m is made of material of refractive index 3/2 , When it is place4 in a liquid, its focal length is increased by 0.225 m. The refractive index of the liquid is

A convex lens of focal length 20 cm made of glass of refractive index 1.5 is immersed in water having refractive index 1.33 . The change in the focal length of lens is

A convex lens of focal length 20 cm in air is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Now the focal length will be

The focal length of lens of refractive index 1.5 in air is 30 cm When it is immersed in water of refractive index (4)/(3) ,then its focal length will be

The focal length of lens of refractive index 1.5 in air is 30cm When it is immersed in water of refractive index (4)/(3) ,then its focal length will be