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Assertion:A convex lens and a concave lens are kept in contact. They will behave as a diverging lens if focal length of convex lens is more. Reason: Power of a concave lens is always less than the power of a convex lens, as power of concave lens is negative whereas power of convex lens is positive.

The magnifying power of an optical instrument is expressed in

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What is the power of the lens, if the far point of a short- sighted eye is 200 cm?