Question

Calculate the speed of light in a medium whose critical angle is 45 o ?

Answer 1

Now, listen to me that refractive index= 1/sin(critical angle). Now the refractive index = 1/1/21/2. 

refractive index=root(2).

Now, speed of light in that medium is always 3* 108/refractive index.

So, 3*108/1.414 =2.121*108. m/sec.