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A defect inside a certain mineral appears to be 0.5 times closer than it really is....

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?

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Answer #1

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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