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Asked in GSEB Board March 2023 · Snell's law, slabs and apparent depth
Given: n=1.5 and c=3×10⁸ m s⁻¹.
Idea: the refractive index of a medium is defined as n=c/v, the factor by which the medium slows light down.
v=c/n=(3×10⁸)/(1.5)
v=2×10⁸ m s⁻¹
Light in ordinary glass travels at about two thirds of its vacuum speed, which is why a glass block delays a pulse and shifts an image.
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