Question

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

A) A convex lens of short focal length
B) A concave lens of short focal length
C) A concave lens of large focal length
D) A convex lens of large focal length​

Answer 1

A convex lens gives a magnified image of an object when it is placed between the radius of curvature and focal length. Also, magnification is more for convex lenses having shorter focal length. Therefore, for reading small letters, a convex lens of focal length 5 cm should be used.

convex lenses having shorter focal length

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Answer 2

Answer:

A convex lens of short focal length