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If the angle of incidence is equal to the critical angle, what is the behavior o

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Question: If the angle of incidence is equal to the critical angle, what is the behavior of the light ray?

Options:

  1. It is refracted at 90°.
  2. It is totally internally reflected.
  3. It is absorbed.
  4. It is transmitted.

Correct Answer: It is refracted at 90°.

Solution: 

When the angle of incidence equals the critical angle, the light ray is refracted along the boundary at 90°, marking the threshold for total internal reflection.

If the angle of incidence is equal to the critical angle, what is the behavior o

Practice Questions

Q1
If the angle of incidence is equal to the critical angle, what is the behavior of the light ray?
  1. It is refracted at 90°.
  2. It is totally internally reflected.
  3. It is absorbed.
  4. It is transmitted.

Questions & Step-by-Step Solutions

If the angle of incidence is equal to the critical angle, what is the behavior of the light ray?
Correct Answer: Light ray is refracted at 90°.
  • Step 1: Understand what the angle of incidence is. It is the angle between the incoming light ray and the normal (an imaginary line perpendicular to the surface).
  • Step 2: Know what the critical angle is. It is the specific angle of incidence at which light can no longer pass into the second medium and instead reflects back.
  • Step 3: When the angle of incidence is equal to the critical angle, the light ray does not enter the second medium but instead travels along the boundary between the two media.
  • Step 4: At this point, the light ray is refracted at an angle of 90° to the normal, meaning it is parallel to the boundary.
  • Step 5: This situation marks the threshold for total internal reflection, where any angle greater than the critical angle will result in the light being completely reflected back into the first medium.
  • Critical Angle – The angle of incidence at which light is refracted at 90° along the boundary between two media.
  • Total Internal Reflection – The phenomenon that occurs when the angle of incidence exceeds the critical angle, causing light to reflect entirely within a medium.
  • Refraction – The bending of light as it passes from one medium to another, depending on the angle of incidence and the refractive indices of the media.
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