JEE Main & Advanced
Physics
Ray Optics
Question Bank
Microscope and Telescope
question_answer
Four lenses of focal length + 15 cm, + 20cm, + 150cm and + 250 cm are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eye-piece should be [CPMT 2001; AIIMS 2001]
A) + 15 cm
B) + 20 cm
C) +150 cm
D) + 250 cm
Correct Answer:
A
Solution :
For largest magnification focal length of eye lens should be least.