Ray Optics and Optical Instruments — Physics STD 12 Science — Question

2. The power of the lens.

Explanation:

For a simple microscope in normal adjustment, the object is placed at a distance equal to f (the ​focal length) from the lens, And the angular magnification is given by the relation

$\text{m}=\frac{\text{D}}{\text{f}}$

for $\text{u}<\text{f},\text{m}=\frac{\text{D}}{\text{f}}+1$

power of lens $=\frac{1}{\text{f}}$

Angular magnification depends on power.