STANDARD Physics Young's Double Slit Experiment MCQ Question
Two sources of light of wavelength 2500 Å and 3500 Å are used in Young’s double slit experiment simultaneously. Which orders of fringes of two wavelength patterns coincide?
3rd order of 1st source and 5th of the 2nd
7th order of 1st and 5th order of 2nd
5th order of 1st and 3rd order of 2nd
5th order of 1st and 7th order of 2nd
Correct Answer
Detailed Explanation
The two fringes coincide when n₁/λ₁ = n₂/λ₂. Solving for n₁/n₂ = λ₂/λ₁ = 3500/2500 = 7/5, the 7th order of the 1st source coincides with the 5th order of the 2nd source.
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