The velocity of light in vacuum is 3 x 10^8 m/s and in glass is 2 x 10^8 m/s. The refractive index of glass is?
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Glass refractive index is defined as the ratio between the speed of light in the vacuum and the speed of light in the glass.
Refractive index of glass (ng) = Speed of light in vacuum/speed of light in the glass.
ng = (3 ×108)/ (2 ×108)
ng = 1.5
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