What is the name of this distinct shadow formed.

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Chapter 22, Problem 16RQ

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What is the name of this distinct shadow formed.

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Consider transmitted light through a thin film of liquid “x” on a lake as shown nair = 1.00 nwater = 1.33 Water = 480 nm (Wavelength of light in the water) vair = 3.00 x 108 m/s (Speed of light in air) vx = 2.36 x 108 m/s (Speed of light in “x”) a) Determine the index of refraction, nx , for the thin film of liquid “x” b) Determine the angle of refraction in water, , as shown in the picture. c) The thickness of the film is equal to 5 air , where air is the wavelength of the light in the air. Determine this thickness.

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