Question

The tube length of microscope is 10 cm and the focal length of its objective is 5 cm. If the eye lens has focal length 0.5 cm. then the magnification of microscope for relaxed eye is :

• A. $45$
• B. $100$
• C. $25$
• D. $10$

Answer 1

The correct option is A $45$

For relaxed eye, $m_e=\frac{25}{f_e}=\frac{25}{0.5}=50$.

SInce image will be formed before infinity, magnification will be less than 50. Hence closest answer from options is 45.