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

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Question: A light ray strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2023)

Options:

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

Correct Answer: 30 degrees

Exam Year: 2023

Solution: 

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

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

Practice Questions

Q1
A light ray strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2023)
  1. 30 degrees
  2. 60 degrees
  3. 90 degrees
  4. 45 degrees

Questions & Step-by-Step Solutions

A light ray strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2023)
  • Step 1: Identify the angle at which the light ray strikes the mirror. This is called the angle of incidence.
  • Step 2: In this case, the angle of incidence is given as 30 degrees.
  • Step 3: Recall the law of reflection, which states that the angle of reflection is equal to the angle of incidence.
  • Step 4: Since the angle of incidence is 30 degrees, 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 a light ray strikes a reflective surface.
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