Question

Select the most appropriate word from the given box and fill in the following blanks.

refracted diameter converging power convex small concave dioptre diverging focal length two aperture

For reacting small letters in a dictionary, we need to use a convex lens of ______ focal length.

Answer 1

For reacting small letters in a dictionary, we need to use a convex lens of small focal length.

Explanation: 

A convex lens of smaller focal length produces higher magnifying power, making small letters appear significantly larger when held within its focus.