Question

A telescope has a focal length of 2000 mm. At what distance from the mirror will the image of an object 5 m from the telescope appear?

Looking for explanation.

Answer 1

Answer: 3.33 m

Explanation: 1/di + 1/do = 1/f = 2m , so 1/di = 1/2 - 1/5 = 3/10 so di = 10/3 or 3.33m