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Optical Instruments — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsOptical Instruments1 Mark
Question
To increase the angular magnification of a simple microscope, one should increase:
  1. The focal length of the lens.
  2. The power of the lens.
  3. The aperture of the lens.
  4. The object size.
✓

Answer

  1. 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.

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