UPSC CDS 2 2023 GK Paper

Question : 38 of 120

Marks: +1, -0

Which one of the following statements is correct regarding the travel of a light beam from a rare to a dense medium?

A light beam travelling from a rare medium to a dense medium slows down and bends towards the normal.
A light beam travelling from a rare medium to a dense medium speeds up and bends towards the normal.
A light beam travelling from a rare medium to a dense medium slows down and bends away from the normal.
A light beam travelling from a rare medium to a dense medium speeds up and bends away from the normal.

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