Question

Determine the maximum and minimum magnifying power of a convex lens of focal length 20 cm.​

Answer 1

Given:

Focal length (f) = 20 cm

To find:

Determine the maximum and minimum magnifying power of a convex lens of focal length 20 cm.​

Solution:

D = 25 cm

Maximum magnifying power = 1 + D/f

Maximum magnifying power = 1 + 25/20

Maximum magnifying power = 1 + 1.25

Maximum magnifying power = 2.25

Minimum magnifying power = D/f

Minimum magnifying power = 25/20

Minimum magnifying power = 1.25