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White light reflected from a soap film (Refractive Index =1.5) has a maxima

White light reflected from a soap film (Refractive Index =1.5) has a maxima at 600 nm and a minima at 450 nm with no minimum in between. Then, the thickness of the film is

Options

(a) 1
(b) 2
(c) 3
(d) 4

Correct Answer:

3

Explanation:

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