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

Jessie Lee

Jessie Lee

Answered question


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



Beginner2022-01-11Added 46 answers

Given that,
refractive index of this oil film (n)=1.25
refractive index of water (n) =1.33
The thickness (t)=mλ2n
for strong reflection and this film m=1
So, t=λ2n=500×1092×1.25
t=200 nm
The thickness is 200 nm


Beginner2022-01-12Added 38 answers

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