Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.

Lesson: Total Internal Reflection

Sample Question Videos

Worksheet • 5 Questions • 1 Video

Q1:

The rays 𝐴 , 𝐡 , and 𝐢 are shown incident on a boundary between water and air, traveling in water. Which incident ray produces total internal reflection?

  • A ray 𝐢
  • B ray 𝐴
  • CNone of the rays produce total internal reflection.
  • D ray 𝐡

Q2:

Which of the following sets of conditions best describes total internal reflection?

  • ATotal internal reflection occurs when a light ray is completely reflected at the boundary between two media of different densities and the light ray is traveling in the higher-density medium.
  • BTotal internal reflection occurs when the angle of reflection of the reflected light ray is equal to the angle of refraction of the refracted ray.
  • CTotal internal reflection occurs when a light ray is completely reflected at the boundary between two media of different densities and the light ray is traveling in the lower density medium.
  • DTotal internal reflection occurs when a light ray is completely absorbed in an object.
  • ETotal internal reflection occurs when the reflected light ray moves along the same path as the incident light ray but in the opposite direction.

Q3:

A light ray travels along an optical fiber by total internal reflection, as shown in the diagram. What is the most correct description for what happens at point 𝑃 if light is sent into the fiber when the fiber is bent?

  • ASome of the light is transmitted out of the fiber at 𝑃 because the angle of incidence there is less than the critical angle.
  • BThe light totally internally reflects at 𝑃 because the angle of incidence there is less than the critical angle.
  • CSome of the light is transmitted out of the fiber at 𝑃 because the angle of incidence there is greater than the critical angle.
  • DThe light totally internally reflects at 𝑃 because the angle of incidence there is greater than the critical angle.
  • ESome of the light is refracted along the fiber surface at 𝑃 because the angle of incidence there is equal to the critical angle.
Preview