Question

What is light ray in physics

Answer 1

Answer:

light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and may be curved in a medium in which the refractive index changes .

Answer 2

$\huge\mathcal\red{ Answer }$

The light ray will travel along the interface without entering the glass prism so the incident ray and emergent ray will be straight and hence angle between incident ray and emergent ray will be 0 degree.