A small telescope has an objective of focal length 150 cm and an eye piece of focal length 3.0 cm. T

Question

A small telescope has an objective of focal length 150 cm and an eye piece of focal length 3.0 cm. The magnifying power of the telescope for viewing a distant object is

Professor PC Thomas Classes · Answer

(c) : Given, focal length of the objective lens $f_0 = 150$ cm and focal length of the eyepiece $f_e = 3.0$ cm. The magnifying power of a telescope for normal adjustment (viewing distant objects) is given by $M = f_0 / f_e$. Substituting the values, $M = 150 / 3.0 = 50$.