A light ray in air hits the surface of water in a glasscontainer. The ray contin

Question

A light ray in air hits the surface of water in a glasscontainer. The ray continues through the water to the bottom of thecontainer and into air again. At what angle does it emerge? Use 30 degrees for the light ray from air to a normal to thesurface of the water.

A light ray in air hits the surface of water in a glasscontainer. The ray continues through the water to the bottom of thecontainer and into air again. At what angle does it emerge? Use 30 degrees for the light ray from air to a normal to thesurface of the water.

Use 30 degrees for the light ray from air to a normal to thesurface of the water.

Explanation / Answer

It must emerge at the same angle, because it is refracted oncegoing from air to water, then refracted back by the same anglegoing back. Using Snell's Law: First Refraction: n1sin1 =n2sin2 Second Refraction: n2sin2 =n1sin3 Therefore, 1 = 3

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