Question

A thin piece of glass with an index of refraction of n₂ = 1.50 is placed on top of a medium that has an index of refraction n₃ = 2.00, as shown in the figure. A beam of light traveling in air (n₁ = 1.00) shines perpendicularly down on the glass. The beam contains light of only two colors, blue light with a certain wavelength and orange light with a certain wavelength.

a)

The blue light has a wavelength in air of 456 nm and the orange light has a wavelength in air of 608 nm. What is the minimum non-zero thickness of the glass that gives completely constructive interference for the orange light reflecting from the film?
_______ nm

b) The blue light has a wavelength in air of 456 nm and the orange light has a wavelength in air of 608 nm. Calculate the minimum non-zero thickness of the glass that gives completely constructive interference for BOTH the blue and orange light simultaneously.
_______ nm

Answer 1