Question

write the expression for critical angle​

Answer 1

The critical angle is that of θ c r i c θ_{cric} θcric which gives a value of exactly 90 degrees. If these values are substituted in the Snell's Law equation, we will get a generic equation that will be used to predict the critical angle....

Answer 2

Light rays travelling through a denser media to the surface of a less dense medium are no longer refracted but completely reflected the angle made by this is called critical angle.

• This critical angle can be expressed as ,

                                sin θc = n2/n1  

• The critical angle is only defined if light travels from a denser medium to a rarer medium.