The wavelength of light in a thin film is 360 nm and the wavelength of light in vacuum is 469 nm.What is the index of refraction for the film?
A)1.10
B)1.30
C)1.50
D)1.70
E)1.90

Question

Quizplus · Accepted Answer

The index of refraction of a material can be calculated using the formula:

n = λvacuum/λfilm

where n is the index of refraction, λvacuum is the wavelength of light in vacuum, and λfilm is the wavelength of light in the thin film.

Substituting the given values, we get:

n = 469 nm / 360 nm ≈ 1.30

Therefore, the index of refraction for the film is approximately 1.30. The closest choice to this value is B, which is the correct answer.

The Wavelength of Light in a Thin Film Is 360