If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be:

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RRB ALP CBT I 17 Aug 2018 Shift 2 Official Paper
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  1. 15°
  2. 30°
  3. 90°
  4. 60°

Answer (Detailed Solution Below)

Option 2 : 30°
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Detailed Solution

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The correct answer is 30°.

Key Points

  • Reflection: The phenomenon in which a light ray is sent back into the same medium from which it is coming, on interaction with a boundary, is called reflection.
  • Laws of reflection: it states that, if a light ray is reflected from a plane flat polished surface its angle of the incident will always be equal to the angle of reflection
    • i.e., The angle of incidence (θ ) = Angle of reflection (θ r )
  • Hence the angle of reflection will be 30°.

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