When does a convex lens behave as a concave lens ?
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When the convex lens is held in a transparent medium of refractive index greater than the refractive index of lens material, it would behave as a concave lens.
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What is the sign of the power of (i) a convex lens (ii) a concave lens ?
State two differences between a convex lens and a concave lens. Give one use of convex lens and one of concave lens.
Calculate the position of the image of an object when placed at (a) focus of a convex lens. (b) focus of a concave lens.
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.
