Question

What happens to wavelength of light when it travels from rarer to denser?

Answer 1

The normal is a line perpendicular (forming a 90 degree angle) to the boundary between the two substances. The bending occurs because light travels more slowly in a denser medium. ... The amount of refraction increases as the wavelength of light decreases.

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Answer 2

Wavelength  and  energy of light decreases when it travel from rarer to denser medium EXCEPT FREQUENCY (COLOUR)