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Why are dark fringes not perfectly dark in diffraction?

Asked by Sanjeev 10th February 2018, 12:04 PM
Answered by Expert
For anything to be perfectly dark it has to absorb all the radiation incident on it.
Which is only possible for a perfectly black body.
There is always some amount of radiation reflected back.
Therefore the fringes are perfectly dark.
Answered by Expert 10th February 2018, 9:01 PM
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