can you explain question 41 of neetprep question bank a bit ? In the solution an expression is given y=7lamdaD/d , i am not able to figure out how
also the significance of calculating n1/n2
https://www.neetprep.com/subject/U3ViamVjdDo1NQ==/topic/VG9waWM6NzAw/newquestions/40
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