If the angle of incidence is equal to the critical angle, what is the angle of r

If the angle of incidence is equal to the critical angle, what is the angle of refraction?

If the angle of incidence is equal to the critical angle, what is the angle of refraction?

Step 1: Understand what the angle of incidence is. It is the angle between the incoming ray and the normal (an imaginary line perpendicular to the surface).
Step 2: Know what the critical angle is. The critical angle is the angle of incidence at which light cannot pass through the boundary and is instead reflected back.
Step 3: Recognize that when the angle of incidence equals the critical angle, the light is at the exact point where it can no longer refract into the second medium.
Step 4: Realize that at the critical angle, the angle of refraction becomes 90°. This means the refracted ray travels along the boundary between the two media.
Step 5: Conclude that if the angle of incidence is equal to the critical angle, the angle of refraction is 90°.

Critical Angle – The angle of incidence at which light is refracted at 90 degrees, causing the refracted ray to travel along the boundary between two media.
Refraction – The bending of light as it passes from one medium to another, which is dependent on the angle of incidence and the refractive indices of the media.