It is common knowledge that the visible light spectrum extends approximately fro

Question

It is common knowledge that the visible light spectrum extends approximately from 400 nm to 700 nm.
In our atmosphere, roughly 400 nm to 500 nm corresponds to blue light, 500 nm to 550 nm corresponds to green, 550 nm to 600 nm to yellow-orange, and above 600 nm to red.
In an experiment, yellow-orange light with a wavelength of 569.9 nm from a laser beam is refracted into a fish tank filled with water with index of refraction 1.333.

a) What is the wavelength of this laser beam in water?

b) What color will this laser beam have in water?
*the color of this beam in water will be blue.
*the color of this beam in water will have the same color it has in air: yellow- orange.

Explanation / Answer

Given: wavelength of red light () = 615.9 *10-9 m index of refraction of water (n) = 1.33 (a) from the snell's law n1 sin1 = n2 sin2 sin1 = 1/h sin2 = 2/h from the above relations n1 / n2 =   2 /1 2 = n11 /n2       = (1.00)( 615.9 *10-9 m)/(1.33)      = 463.0*10-9 m      = 463 nm (b) In water laser is in blue color.

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