Explain what is critical angle?

If the light rays are travelling from a denser to a rarer medium, there might be an incident angle when the refracted angle becomes 90 , this incident angle is known as the critical angle for that pair of mediums. The critical angle for a pair of mediums can be found out by using Snell’s law by putting refracted angle as 90 in the equation:

Here incident angle is critical angle for the two mediums.

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