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

Define object space.

Define image space.

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

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

If the object and image distance is 30 cm of a convex lense then its focal length is

Dead space air is the

An object and the image obtained from the lens are as given above. If the distance between the object and the image is 36 cm and the magnification is -2, find the focal length of the lens and draw the ray diagram to show the position of the lens.

For concave mirror, if the object is within the focal length, its image is