Practice portal › Ray Optics and Optical Instruments › Refraction and Total Internal Reflection
Asked in GUJCET 2016 · Snell's law, slabs and apparent depth
Given: refractive index of the medium n = 2; wavelength 5000 A.
Idea: the refractive index is defined by n = c/v, so v = c/n.
v = (3×10⁸)/2 = 1.5×10⁸ m/s.
The wavelength is given only to say which light it is; the speed in the medium depends on n alone.
So the velocity is 1.5×10⁸ m/s.
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