Question

The focal lengths of the objective and eyepiece of a compound microscope are \( 1 \, \text{cm} \) and \( 10 \, \text{cm} \) respectively. Length of the tube is \( 25 \, \text{cm} \). If the final image is formed at infinity, the magnifying power of the microscope is:

• A. 70
• B. 35
• C. 7.0
• D. 3.5

Hint:

For final image at infinity, use \( M = \frac{L}{f_o}\frac{D}{f_e} \) with \( D = 25 \, cm \).

Answer 1

The Correct Option is B