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Diffraction grating question

The answer is supposed to be D. Why is my method wrong?? Help please
Screenshot 2023-07-13 024354.png
(edited 9 months ago)
Reply 1
The answer uses the equation correctly so well done you. However there is a zero order max which makes 4 and the three the other side which makes 7.
Some people say that having hollowed out a level physics content to a ridiculous extent, examiners are reduced to trick question.
Thank you very much!!!
Questions like these are what make me lose my sanity TvT

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