The index of refraction for a certain type of glass is 1.641 for blue light and 1.603 for red light. when a beam of white light (one that contains all colors) enters a plate of glass from the air at an incidence angle of 40.05∘, what is the absolute value of the angle in the glass between blue and red parts of the refracted beams?

The angle between the emergent blue and red light is

Explanation:

We have according to Snell's law

Since medium from which light enter's is air thus

Thus for blue incident light we have

Similarly using the same procedure for red light we have

Thus the absolute value of angle between the refracted blue and red light is

think its the third option