# 1: What is the thinnest soap film that will strongly reflect red light from a helium-neon...

###### Question:

1: What is the thinnest soap film that will strongly reflect red light from a helium-neon laser? The wavelength of this light is 633 nm in air and 470 nm in soapy water.

2 What is the wavelength of the light from a carbon dioxide laser when it is in glass with an index of refraction of 1.7? The wavelength in a vacuum is 10600 nm.

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