An equi-convex glass lens with radius of each face as R is placed in air `(._au_g=3//2)`. "If there is water in the object space and air in the image space and given" `._au_w=4//3`, the focal length of the lens is

There is an equiconcave glass lens with radius of each face as R and ._(a)mu_(g) = 3//2 and ._(a)mu_(W) = 4//3 . If there is water in object space and air in image space, then the focal length is

In the above question if there is air in the object space and water in the image space, then the focal length is

If in a convex lens object and its image distances are each equal to d, the focal length of the lens is

Draw ray diagram showing the image formation by a convex lens when an object is placed at twice the focal length of the lens.

A convex lens made of a glass of refractive index 3//2 has a focal length 'f' in air. If it is immersed into water of refractive index 4//3 , then with calculation, predict the new focal length of the lens inside water.

The radius of curvature of each face of a biconcave lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens is air.