Question

Out of which of the following has maximum speed if refractive index of water is 1.33 rock salt 1.54 benzene 1.50 and Ruby 1.71

Answer 1

We know that refractive index is expressed as n=c/v,where c is speed of light in vaccum.so in the above questions refractive index of different different material is given.so we can easily calculate speed .

For water

1.33= 3×10^8/v

v= 3 ×10^8/1.33

=__m/s

From this way you can calculate for others also.

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