Question

Which of these statements about Total internal reflection is correct?

• A. Occurs when the angle of incidence is greater than a certain limiting angle, called the critical angle
• B. Reflection takes place at the boundary between two transparent media
• C. Light is completely reflected back and no image is formed
• D. Normal reflection occurs

Answer 1

Answer: (A), (B)

The correct options are
A Occurs when the angle of incidence is greater than a certain limiting angle, called the critical angle
B Reflection takes place at the boundary between two transparent media

Complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium is total internal reflection. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle. In general, total internal reflection takes place at the boundary between two transparent media when a ray of light in a medium of higher index of refraction approaches the other medium at an angle of incidence greater than the critical angle.