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Wave Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWave Optics1 Mark
MCQ
Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see
  • A
    No interference
  • B
    Interference with bright bands
  • C
    Interference with dark bands
  • ✓
    Interference in which width of the fringe will be slightly increased
✓

Answer

Correct option: D.
Interference in which width of the fringe will be slightly increased
The refractive index of air is slightly more than $1.$ When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.

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