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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 18 - Refraction at Spherical Surfaces > A convex lenses of focal length 40 cm is held coaxially 12 cm above a concave mirror of focal length 18 cm. An object held x cm above the lens gives rise to an image coincident with it. Then x is equal to

A convex lenses of focal length 40 cm is held coaxially 12 cm above a concave mirror of focal length 18 cm. An object held x cm above the lens gives rise to an image coincident with it. Then x is equal to

A convex lens of glass has power P in air. If it is immersed in water its power will be