Question

A child has near point at 10 cm. What is the maximum angular magnification the child can have with a convex lens of focal length 10 cm?

Answer 1

Given:
Distance of near point, D = 10 cm
Focal length, f = 10 cm
When the image is formed at the near point, D = 10 cm, the magnifying power (m) of a simple microscope is given as:

` m = 1+D/f`

= `1+10/10 = 1+1 =2`

Thus, the maximum angular magnification is 2.