Thu March 07, 2013 By: Ankur Pandey

Which o the following lenses would you prefer to use while reading small letters found in dictionary? (a)a convex lens o focal length 50 cm. (b) a convex lens of focal lenth 5 cm plzzz give reason too?

Expert Reply
Sun March 10, 2013
A convex lens gives a magnified image of an object when it is placed between the radius of curvature and focal length. Also, magnification is more for convex lenses having shorter focal length. Therefore, for reading small letters, a convex lens of focal length 5 cm should be used.
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