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The index of refraction for Lucite is 2.25. What is the approximate speed of light in the Lucite?

Respuesta :

AL2006
Index of refraction for a substance is

(speed of light in vacuum) divided by (speed of light in the substance) .

So . . .

(299,792,458 m/s) / (speed of light in Lucite) = 2.25

Speed of light in Lucite = (299,792,458 m/s) / 2.25

= 133,241,092 m/s

(That's 1/2.25 = 44.4% of the speed of light in vacuum.) 

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