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Which of the following conditions is necessary for total internal reflection to

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Question: Which of the following conditions is necessary for total internal reflection to occur?

Options:

  1. Light must travel from a denser to a rarer medium
  2. Light must travel from a rarer to a denser medium
  3. The angle of incidence must be less than the critical angle
  4. The angle of incidence must be equal to the critical angle

Correct Answer: Light must travel from a denser to a rarer medium

Solution: 

Total internal reflection occurs only when light travels from a denser medium to a rarer medium and the angle of incidence exceeds the critical angle.

Which of the following conditions is necessary for total internal reflection to

Practice Questions

Q1
Which of the following conditions is necessary for total internal reflection to occur?
  1. Light must travel from a denser to a rarer medium
  2. Light must travel from a rarer to a denser medium
  3. The angle of incidence must be less than the critical angle
  4. The angle of incidence must be equal to the critical angle

Questions & Step-by-Step Solutions

Which of the following conditions is necessary for total internal reflection to occur?
Correct Answer: Light travels from denser to rarer medium and angle of incidence > critical angle
  • Step 1: Understand what total internal reflection is. It happens when light cannot pass from one medium to another and instead reflects back into the original medium.
  • Step 2: Identify the two types of media involved. A denser medium (like water or glass) and a rarer medium (like air).
  • Step 3: Know that light must travel from the denser medium to the rarer medium for total internal reflection to happen.
  • Step 4: Learn about the critical angle. This is the specific angle of incidence (the angle at which light hits the boundary) that must be exceeded for total internal reflection to occur.
  • Step 5: Remember that if the angle of incidence is greater than the critical angle, total internal reflection will take place.
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