=(4)/(3)*If" there is water in object space and air of image space ""then the focallength"

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

Define object space.

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

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

Define image space.

Dead space air in man is

Dead space air in man is :