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Wave Optics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
A microscope is used with sodium light and its resolving power is not sufficiently large. Higher resolution will be obtained by using wavelength of:
  • A
    20 micron
  • B
    2 micron
  • C
    1 micron
  • D
    400$\mathring{\text{A}}$
✓

Answer

  1. 400$\mathring{\text{A}}$

Explanation:

Since power of resolution is more for violet than for red, we conclude that resolving power is greater for light with lower wavelengths.

Wavelength of sodium light is around 589nm.

Hence resolving power increases for light with lower wavelength.

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