A refracting telescope has an objective of focal length and an eyepiece of focal length

PHYSICS · Single correct · A Level · Physics · Astrophysics · Astrophysics

Problem

A refracting telescope has an objective of focal length

f_o = 1.0\,\text{m}

and an eyepiece of focal length

f_e = 5.0\,\text{cm}

. Its magnifying power under normal adjustment is (a)

+0.05

(b)

-20

(c)

+20

(d)

-0.2