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

(a) 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

Answer –

The correct option is (c).

When an object is put between the radius of curvature and the focus of a convex lens, the object on the opposite side of the lens is magnified.
The magnification of the convex lens is greater when the focal length is shorter. As a result, a convex lens with a shorter focal length will be used to read the small letters.