Question

The magnifying power of simple microscope in normal adjustment is-

(i) \(1 + \frac{D}{F}\)

(ii)  \(1 + \frac{F}{D}\)

(iii) \(\frac{F}{D}\)

(iv) \(\frac{D}{F}\)

Answer 1

Correct option is: (i) \(1 + \frac{D}{F}\) 

The magnifying power of a microscope is given by

\(m= 1 + \frac{D}{F}\)

where f is the focal length of the lens and D is the least distance of distinct vision for the normal eye. 

The magnifying power of a microscope can be increased by using a lens of short focal length. But it cannot be increased indefinitely.