How do astronomers calculate a telescope's light collecting area (A)? (where r = radius of the telescope's mirror or lens)
A) A = 2?r
B) A = ?r2
C) A = 4?r2
D) A = 4/3 ?r3

Question

Quizplus · Accepted Answer

The light collecting area of a telescope is calculated using the formula for the area of a circle, A = πr², where r is the radius of the telescope's mirror or lens.

How Do Astronomers Calculate a Telescope's Light Collecting Area (A)