Reflection and refraction of colored light in water air surface 2, varying incidence angle

Light propagating in water reaches a plane surface separating water from air. A fraction of light reflects back and the remaining fraction refracts to air. As the incident angle goes up more and more light reflects until the critical angle is reached. For angles of incident greater than the critical angle all the light reaching the surface reflects (total internal reflection). Some colored filters are glued at the orifices. The original light from this apparatus is white halogen.

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