A Certain Kind of Glass Has N_blue = 1 $\degree$ ,What Is the Angle Between the Red and Blue Light

Multiple Choice

A certain kind of glass has n_blue = 1.650 for blue light and n_red = 1.610 for red light.If a beam of white light (containing all colors) is incident at an angle of 30.0 $\degree$ ,what is the angle between the red and blue light inside the glass?

A) 0.22 $\degree$
B) 0.45 $\degree$
C) 1.90 $\degree$
D) 1.81 $\degree$