Question

A Galilean telescope measure 9 cm from the objective to the eye-piece. The focal length of the objective is 15 cm, its magnifying power is –

• A. 2.5
• B. 2/5
• C. 5/3
• D. 0.4

Answer 1

Answer: (A)

2.5

Answer 2

f_o – f_e = 9cm ….(1) f_o = 15 cm

Putting Ist 15 – f_e = 9cm Ž f_e = 6 cm