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A ray of light strikes a plane mirror at an angle of 30 degrees to the normal. W

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Question: A ray of light strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2022)

Options:

  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 90 degrees

Correct Answer: 30 degrees

Exam Year: 2022

Solution: 

According to the law of reflection, the angle of reflection is equal to the angle of incidence. Therefore, the angle of reflection is 30 degrees.

A ray of light strikes a plane mirror at an angle of 30 degrees to the normal. W

Practice Questions

Q1
A ray of light strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2022)
  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 90 degrees

Questions & Step-by-Step Solutions

A ray of light strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2022)
  • Step 1: Identify the angle at which the ray of light strikes the mirror. In this case, it is 30 degrees to the normal.
  • Step 2: Understand the law of reflection, which states that the angle of reflection is equal to the angle of incidence.
  • Step 3: Since the angle of incidence is 30 degrees, according to the law of reflection, the angle of reflection will also be 30 degrees.
  • Law of Reflection – The principle stating that the angle of incidence is equal to the angle of reflection when light strikes a reflective surface.
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