If the x rays reflecting from a top reflection plane and the x rays reflecting f

Question

If the x rays reflecting from a top reflection plane and the x rays reflecting from the next deeper, parallel plane undergo fully constructive interference, which is true?

The path length difference is an odd number of half wavelengths, and the intensity is minimum The path length difference is an integer number of wavelengths, and the intensity is minimum. The path length difference is an odd number of half wavelengths, and the intensity is maximum. The path length difference is an integer number of wavelengths, and the intensity is maximum.

Explanation / Answer

answer is D

The path length difference is an integer number of wavelengths, and the intensity is maximum.

Path difference is odd for destructive interfrenece

since for constructive interfrence condition is

  path length difference is an integer number of wavelengths,

and the intensity is maximum in this case

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