According to Snell's law, the factor that remains constant for a given pair of media and different angles of incidence and refraction is:

Refractive index

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Solution

The correct option is A Refractive index
According to Snell's law, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.
$\frac{s i n i}{s i n r} =$ constant
This constant is the refractive index of second medium w.r.t the first medium.

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