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MHT CET202121 Sep 2021Evening ShiftPhysicsWave OpticsActual

Two coherent sources ' P ' and ' Q ' produce interference at point ' A ' on the screen, where there is a dark band which is formed between 4^ th and 5^ th bright band. Wavelength of light used is 6000 Å . The path difference PA and QA is

Options

  1. A3.6 10⁻⁴ ~cm
  2. B3.2 10⁻⁴ ~cm
  3. C2.4 10⁻⁴ ~cm
  4. D2.7 10⁻⁴ ~cm

Correct answer

D. 2.7 10⁻⁴ ~cm

Step-by-step solution

The dark band between the 4^ th and 5^ th bright band in the 5^ th dark band. For 5^ th dark band, the path difference is (5- 1 2 ) =4.5 =4.5 6000=2.7 10⁻⁴ ~cm

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