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Question

Refractive index of glass is 1.5. Find the speed of light in glass, if its speed in air is 3×108ms1. Also find critical angle for glass.

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Solution

we know that refractive index n=speedoflightinvacuumspeedoflightinmedium
where c=3×108m/s
1.5=cv
v=3×1081.5
v=2×108m/s
For critical angle we will use snell's law
C is critical angle
nglasssinC=nairsin90 nair=1
sinC=1nglass=11.5
C=41.8o

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