Question R14 Q21 - NSB 2011 Set 4

A beam of white light is incident on a triangular glass prism with an index of refraction of 1.5 for visible light, producing a spectrum. Initially, the prism is in a glass aquarium filled with air. If the aquarium is filled with water with an index of refraction of 1.3, which of the following is true?

W) The spectrum produced has the deviation of the beam opposite to that in air

X) The positions of red and violet are reversed in the spectrum

Y) The spectrum produced has greater separation between red and violet than that produced in air

Z) The spectrum produced has lesser separation between red and violet than that produced in air

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