A
Angle at which light travels along the boundary between two media
B
Angle at which refraction stops
C
Angle at which a lens focuses parallel rays
D
Angle of maximum diffraction
Correct Answer: Option A — Angle at which light travels along the boundary between two media
Explanation:
The critical angle is the angle of incidence in the denser medium at which the refracted ray travels along the boundary and above which tota...
The critical angle is the angle of incidence in the denser medium at which the refracted ray travels along the boundary and above which total internal reflection occurs.