Consider a soap film that is the thinnest film that will produce a bright blue light when illuminated with the white light. The index of refraction of the soap film is 1.35 and the blue light is monochromatic with wavelength 411 nm. a) Calculate the thickness of the film if the soap covers a piece of crown glass with index of refraction of 1.52.

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Chapter25: Geometric Optics
Section: Chapter Questions
Problem 22PE: An optical fiber uses flint glass clad with crown glass. What is the critical angle?
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Consider a soap film that is the thinnest film that will produce a bright blue light when illuminated with the white
light. The index of refraction of the soap film is 1.35 and the blue light is monochromatic with wavelength 411 nm.
a) Calculate the thickness of the film if the soap covers a piece of crown glass with index of refraction of 1.52.

b) Suppose the reflections occur instead from the soap film on water with index of refraction of 1.33. Determine the
thickness of the film on the water that will produce the same blue colour of reflected light

a)
air
nair = 1.00
soap film
nfilm = 1.35
glass
nglass = 1.52
the thickness of the fil
Transcribed Image Text:a) air nair = 1.00 soap film nfilm = 1.35 glass nglass = 1.52 the thickness of the fil
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