10 points Save Answer Light of a certain wavelength will reflect off of the top

Question

10 points Save Answer Light of a certain wavelength will reflect off of the top (1) and bottom (2) surfaces of a butterfly scale to constructively interfere. However, light can also reflect off the top surface of the next consecutive scale (3), and cause constructive interference for other wavelengths of light (this is why butterfly scales seem to made up of a mixture of many different colors). In the diagram to the right all these paths are straight up and down. The index of refraction of the butterfly scale is 1.6 Question1 Diagram of Irridescent moth wings 65 nm 165 nm Will there be a phase shift for a light ray following path (1)? Will there be a phase shift for a light ray following path (2)?

Explanation / Answer

pat1 yes

path 2 no

t = lambda/4n

laqmbda = 65nm*4*1.6 = 416 nm

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