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

[1 mark]

Wavelength

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Speed

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Distance

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Refractive index

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Solution

The correct option is D 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.

$\frac{sin i}{sin r}$ = constant

Where i = Angle of incidence
r = Angle of refraction
This constant is the refractive index of the second medium with respect to the first medium.

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