Which of the following lenses would you prefer to use while reading small letters found in a dictionary ?

Options

A. A convex lens of focal length 50 cm
B. A concave lens of focal length 50 cm
C. A convex Jens of focal length 5 cm
D. A concave lens of focal length 5 cm

Answer

C

Explanation

a magnified image of an object will be obtained when it is placed between the optical centre and focus of the convex lens. magnification is also higher for convex lenses having short of focal length therefore, for reading small letters a convex lens of focal length 5cm should be used