calculate speed of light in a medium whose critical angle is 30 degree.

_{c}, where i

_{c }is critical angle = 30

^{0}

So, n = 2

As, n = c/v , where c - speed of light in vacuum and v is the speed of light in medium.

So, speed of light in given medium (v) = c/n = 1.5 X10

^{8}m /sec

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