critical angle in case of bending light by 90 or 180 degree must be less than 45 degree. why?

Asked by akankshyasahu | 25th Apr, 2011, 06:17: PM

Expert Answer:

According to Snell's law we know that 
 
where is the angle formed by incident ray with the normal and  is the angle formed by the refracted ray with the normal
 
 is the refractive index of the medium 2 and  
And according to snell's law the critical angle is only defined when \frac{n_2}{n_1} is less than 1
 
Therefore critical angle in case of bending light by 90 or 180 degree must be less than 45 degree because if it is 45 degree then  \frac{n_2}{n_1}  will be equal to 1 , so it wont satisfy the snell's law.

Answered by  | 30th Apr, 2011, 11:35: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.