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b)how far would the fourth maximum be from the central maximum?

a) Given: lambda = 500 x 10e-9 m

d= 0.1 x 10e-3 m

L= 1.2 m

delta x = lambda x L/d

=(500 x 10e-9 m) (1.2 m)/(0.1 x 10 e-3 m)

=0.0006 m

=6.0 x 10 e-3

Therefore, the distance between each maximum is 6.0 x 10 e-3 m

b) Since the distance between each maximum is 6.0 x 10 e-3 m the fourth maximum would be 4 x (6.0 x 10 e-3 m)

Therefore, 4 x (6.0 x 10 e-3 m) = 2.4 x 10 e-2

Therefore, the fourth maximum would be 2.4 x 10 e-2 m away from the central maximum.

Does this look like I'm doing this question right to anybody?