Optics Question 335

Question: The focal lengths of the objective and eye-lens of a microscope are 1 cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45, then the length of the tube is

[CPMT 1979]

Options:

A) 30 cm

B) 25 cm

C) 15 cm

D) 12 cm

Show Answer

Answer:

Correct Answer: C

Solution:

By using m=(Lfofe).Dfofe

45=(L15)×251×5L=15cm .



NCERT Chapter Video Solution

Dual Pane