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Pls help.. Answer is three.... Shouldn't it be five....???

Pls help..
Answer is three.... Shouldn't it be five....???

Question Image
Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
576-677_IMG_20200415_122541.jpg
Arun
25763 Points
one year ago
For Maxima it's known
dSinθ = nλ
Given d=2λ
So 2λsinθ = nλ
2sinθ=n
Value of sinθ varies from -1 to +1 so there total five possibilities for Maxima interference for n = -2,-1,0,+1,+2

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