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Question: What is the minimum thickness of soap film needed for constructive interference in reflected light, ...

What is the minimum thickness of soap film needed for constructive interference in reflected light, if the light incident on the film is 750nm? Assume that the refractive index for the film is μ=1.33.\mu = 1.33.:

A

282 nm

B

70.5 nm

C

141 nm

D

387 nm

Answer

141 nm

Explanation

Solution

: Here, 2μt=λ22\mu t = \frac{\lambda}{2}

∴tλ4μ7504×1.33min⁡\therefore{t\frac{\lambda}{4\mu}\frac{750}{4 \times 1.33}}_{\min}