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

(c) A convex lens of focal length 5 cm

When reading tiny letters in a dictionary, a convex lens with a 5 cm focal length can be utilised.