question_answer 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:

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