The focal lengths of the objective and the eyepiece of the telescope are 225 cm and 5 cm respectively. The magnifying power of the telescope will be

Options

A. a)49
B. b)54
C. c)35
D. d)60

Answer

B

Explanation

Given, `f_0 = 225 "cm" and t_8 = 5 "cm"`
We know magnifying power of the telescope
`M = (f_0)/(f_a) = (225)/(5) = 45`