Question

The magnifying power of telescope is high if

• A. both objective and eye-piece have short focal length
• B. both objective and eye-piece have long focal length
• C. the objective has a long focal length and the eye-piece has a short focal length
• D. the objective has a short focal length and the eye piece has a long focal length

Answer 1

Answer: (C)

the objective has a long focal length and the eye-piece has a short focal length

Answer 2

Magnifying power of telescope is $\frac{f_{o}}{f_{e}}$, so the magnifying power of telescope will be high if the objective has a long focal length and the eye piece has a short focal length.