A ray of light enters glass of refractive index 1.5 from air. If the speed of light in vacuum is 3×10 to the power 8m/s, what is the speed of light in glass
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n = c/v
n(glass) = 3 x 10^8/ speed of light in glass
speed of light in glass = 3 x 10^8/1.5
= 2 x 10^8 m/s
:-)
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