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Answer 1

Answer:

4. The refractive index of any substance actually means the ratio of the Sines of the angles made by the ray of light with the substance.

Let x denote the angle made by the ray with the substance in air, and y denote the angle made by it with the substance in the substance.

So,

$\frac{ \sin(y) }{ \sin(x) } = 2.42$