1.

If the critical angle for total internal reflection from a medium to vaccum is 30^(@), the speed of light in the mediu is

Answer»

`3xx10^(8)ms^(-1)`
`1.5xx10^(8)ms^(-1)`
`sqrt3xx10^(8)ms^(-1)`
`2XX10^(8)ms^(-1)`

SOLUTION :`n=(1)/(sini_(c))=(1)/(sin 30^(@))=2`
`therefore"Speed of light in the medium V"=(c)/(n)=(3xx10^(8))/(2)=1.5xx10^(8)ms^(-1)`


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