A very thin oil film (n = 1.25) floats on

Krzychau1

Krzychau1

Answered question

2021-12-30

A very thin oil film (n = 1.25) floats on water (n = 1.33). What is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm?

Answer & Explanation

kaluitagf

kaluitagf

Beginner2021-12-31Added 38 answers

Given data:
The refractive index for the oil film is no=1.25
The refractive index for the water is nw=1.33
The wavelength is λ=500 nm
For the thinnest film, the value of m will be 1.
The thickness can be calculated as:
t=m(λ2no)
t=(1)(500 nm2×1.25)
t=200 nm
Thus, the thickness of the thinnest film is 200 nm.

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