Answer:
The critical angle for a light ray traveling 36.9°
Explanation:
The critical angle for a light ray traveling is calculated by
apply Brewster angle tanθ = nb / na
where, nb is refractive index of surface
na is the refractive index of water
tan θ = 1.00 / 1.33
tan θ = 0.7519
θ = 36.9°
Therefore, the critical angle for a light ray traveling 36.9°
