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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 18 - Refraction at Spherical Surfaces > A combination of two thin lenses with focal lengths f1 and f2 respectively forms and image of distant object at distance 60cm when lenses are in contact. The position of this image shifts by 30cm towards the combination when two lenses are separated by 10 cm. The corresponding values of f1 and f2 are

A combination of two thin lenses with focal lengths f1 and f2 respectively forms and image of distant object at distance 60cm when lenses are in contact. The position of this image shifts by 30cm towards the combination when two lenses are separated by 10 cm. The corresponding values of f1 and f2 are

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