how is the refraction index of material related to
real and apparent depth
velocity of light in vaccum or air and the velocity of light in the given medium
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The refractive index of the medium is the ratio of the velocity of light in vacuum (or air) to the velocity of light in that medium. ... (i) The light must travel from a denser medium to a rarer medium. (ii) The angle of incidence must be greater than the critical angle (ic) for the pair of media.
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