Find the angle of incidence at which a light beam traveling from a medium having the index of refraction n1 = 2.7 to another medium having the index of refraction n2 = 1.6 suffers a total internal reflection.

The angle of incidence at which total internal reflection takes place will be equal to

Explanation:

We have given that light is traveling from a medium  of refractive index x 2.7 to a medium of refractive index 1.6

So refractive index of first medium and

We have to find the angle of incidence for total internal reflection

For total internal reflection

So the angle of incidence at which total internal reflection takes place will be equal to

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge