A department store sells an "astronomical telescope" with an objective lens of 30-cm focal length and a diameter of 5 cm,and an eyepiece lens of focal length 5 mm and diameter 4 mm.What is the magnifying power of this telescope?
A) 6 times
B) 150 times
C) 60 times
D) 12.5 times

Question

Quizplus · Accepted Answer

The magnifying power of a telescope is given by the formula:

Magnifying power = focal length of objective lens / focal length of eyepiece lens

Substituting the given values:

Magnifying power = 30 cm / 5 mm

Converting both values to the same units (millimeters):

Magnifying power = 300 mm / 5 mm = 60

Therefore, the magnifying power of this telescope is 60 times.

A Department Store Sells an "Astronomical Telescope" with an Objective