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Define the refraction index of the secon...

Define the refraction index of the second medium with respect to the first medium.

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The refractive index of the second medium with respect to the first medium is defined as the ratio of the sine of the angle of incidence to the sine of the angle of refraction when the ray of light is obliquely incident at the boundary separating the two media and travels from the first medium to the second medium.
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The refractive index of the second medium with respect to the first medium is defined as the ratio of the magnitude of the velocity of light in the first medium to the magnitude of the velocity of light in the second medium.
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