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

Options

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

Explanation

For reading small letters in a dictionary, we need to use a convex lens of smaller focal length. Choice ( c) is correct.