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What happens to the light ray when it hits the boundary at an angle greater than

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Question: What happens to the light ray when it hits the boundary at an angle greater than the critical angle?

Options:

  1. It is refracted
  2. It is absorbed
  3. It is reflected back into the denser medium
  4. It passes into the rarer medium

Correct Answer: It is reflected back into the denser medium

Solution: 

When the angle of incidence exceeds the critical angle, the light ray undergoes total internal reflection and is reflected back into the denser medium.

What happens to the light ray when it hits the boundary at an angle greater than

Practice Questions

Q1
What happens to the light ray when it hits the boundary at an angle greater than the critical angle?
  1. It is refracted
  2. It is absorbed
  3. It is reflected back into the denser medium
  4. It passes into the rarer medium

Questions & Step-by-Step Solutions

What happens to the light ray when it hits the boundary at an angle greater than the critical angle?
Correct Answer: Total internal reflection occurs.
  • Step 1: Understand that light travels through different materials, like air and water.
  • Step 2: Know that when light moves from a denser medium (like water) to a less dense medium (like air), it can change direction.
  • Step 3: The angle at which the light hits the boundary between the two materials is called the angle of incidence.
  • Step 4: The critical angle is a specific angle of incidence. If the light hits the boundary at an angle greater than this critical angle, something special happens.
  • Step 5: When the angle of incidence is greater than the critical angle, the light does not pass into the less dense medium (air).
  • Step 6: Instead, the light ray reflects back into the denser medium (water) instead of refracting out.
  • Total Internal Reflection – When light hits the boundary at an angle greater than the critical angle, it does not refract into the less dense medium but is instead completely reflected back into the denser medium.
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