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question on light


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Just to add to what swansont has said:


The refractive index can be understood as


[math]n = \frac{\textnormal{speed of light in vacuum}}{\textnormal{speed of light in medium}}[/math].


For pyrex we have [math]n= 1.474[/math], for common glasses [math]n = 1.52-1.62[/math].


You can now explore this with some numerical examples.

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