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

Distance

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Refractive index

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Speed

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Wavelength

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Solution

The correct option is B 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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\frac{sin i}{sin r} = c o n s t a n t

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Given that i is angle of incidence and r is angle of refraction for a light ray at a boundary, the correct expression for Snell's Law is:

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