Question

A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object?

Options

• 17

• 32

• 34

• 28

Answer 1

28

Explanation:

Given: Focal length of the objective lens (f_o) = 140 cm

Focal length of the eyepiece (f_e) = 5.0 cm

Magnifying power (m) = `f_o/f_e`

= `140/5`

= 28

∴ The magnifying power of the telescope for viewing a distant object is 28.