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Q: A ray of light is incident on an interface separating two media along the normal to the interface. The angle between the incident ray and refracted ray is equal to :
  • A. 90⁰
  • B. 0⁰
  • C. 45⁰
  • D. 30⁰
Correct Answer: Option B - When a ray of light is incident on an interface separating two medium along the normal to the interface, it don get deflected from it initial path and therefore undergoes no refraction, it follows straight path. Therefore in this situation angle between incident ray and refracted ray is 0⁰.
B. When a ray of light is incident on an interface separating two medium along the normal to the interface, it don get deflected from it initial path and therefore undergoes no refraction, it follows straight path. Therefore in this situation angle between incident ray and refracted ray is 0⁰.

Explanations:

When a ray of light is incident on an interface separating two medium along the normal to the interface, it don get deflected from it initial path and therefore undergoes no refraction, it follows straight path. Therefore in this situation angle between incident ray and refracted ray is 0⁰.