A defect inside a certain mineral appears to be 0.5 times closer than it really is. In vacuum the light travels at exactly 299792458 m/s. How fast does the light travel inside this mineral?
Apperent depth h = 0.5(real depth)
real depth/apperent depth = 1/0.5
= 2
We know index of refraction = real depth/apperent depth
n = 2
We know n = speed of light in vacuum / speed of light in mineral
Speed of light inmineral = speed of light in vacuum / 2
= 299792458 / 2
= 149896229 m/s
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