Test, May 4,2018: 9-12 nidental usp n id siur on eick and tisiluminaled by white lghth...

Question

Question

Answer 1

Answer #1

for oil film, the equation for constructive interference is given by:

2*n_oil*d*cos(theta)=(m-0.5)*lambda

where n_oil=refractive index of oil=1.4

d=thickness of oil slick=150 nm

theta=incident angle=45 degrees

m is any integer

hence lambda=2*n_oil*d*cos(theta)/(m-0.5)

for different values of m,

lambda values are given as :

m lambda

1 594 nm

2 198 nm

3 118.8 nm

so for m=1, wavelength falls between the wavelength range of 400 nm to 700 nm

hence corresponding color is orange.

Answer 2

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