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

Q. 6 :- 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:-

(c) A convex lens of focal length 5 cm.