   Chapter 27, Problem 71PE

Chapter
Section
Textbook Problem

An oil slick on water is 120 nm thick and illuminated by white light incident perpendicular to its surface. What color does the oil appear (what is the most constructively reflected wavelength), given its index of refraction is 1.40?

To determine

Wavelength and color of reflected light

Explanation

Given info:

Thickness of the oil slick, t=120nm

Refractive index of oil, n=1.40

Formula used:

Thickness of the film producing constructing interference is calculated by the formula

t=λ4n

Here,

λ is the wavelength of the reflected light

n is the refractive index

t is the thickness of the film producing interference

Calculation:

The wavelength of the reflected light is calculated by the formula

t=λ

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