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

Start Practicing

Worksheet: Total Internal Reflection

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

Q2:

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

  • ATotal internal reflection occurs when the reflected light ray moves along the same path as the incident light ray but in the opposite direction.
  • BTotal 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.
  • CTotal internal reflection occurs when a light ray is completely absorbed in an object.
  • DTotal 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.
  • ETotal internal reflection occurs when the angle of reflection of the reflected light ray is equal to the angle of refraction of the refracted ray.

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 refracted along the fiber surface at 𝑃 because the angle of incidence there is equal to the critical angle.
  • BSome of the light is transmitted out of the fiber at 𝑃 because the angle of incidence there is greater than the critical angle.
  • CThe light totally internally reflects at 𝑃 because the angle of incidence there is greater than the critical angle.
  • DSome of the light is transmitted out of the fiber at 𝑃 because the angle of incidence there is less than the critical angle.
  • EThe light totally internally reflects at 𝑃 because the angle of incidence there is less than the critical angle.

Q4:

Which of the following most correctly describes what happens if a light ray traveling in water contacts a boundary between air and water at an angle greater than the critical angle for a water–air interface?

  • AThe light propagates along the boundary between air and water.
  • BSome light is transmitted from the water into the air and some light reflects from the air back into the water.
  • CThe light is completely transmitted from the water into the air.
  • DThe light completely reflects from the air back into the water.

Q5:

Which of the following definitions best describes the critical angle for total internal reflection?

  • AThe critical angle is the angle at which all incident light at a boundary is reflected.
  • BThe critical angle is the angle of incidence minus the angle of refraction.
  • CThe critical angle is the angle of incidence plus the angle of refraction.
  • DThe critical angle is the angle at which the refracted ray travels along the boundary from which the incident ray is reflected.
  • EThe critical angle is the angle of refraction minus the angle of incidence.