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A beam of light passes through a prism with an angle of 60 degrees and has a ref

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Question: A beam of light passes through a prism with an angle of 60 degrees and has a refractive index of 1.5. What is the angle of minimum deviation?

Options:

  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 15 degrees

Correct Answer: 30 degrees

Solution: 

For a prism, the angle of minimum deviation (D) can be approximated as D = A for small angles, thus D = 60 degrees.

A beam of light passes through a prism with an angle of 60 degrees and has a ref

Practice Questions

Q1
A beam of light passes through a prism with an angle of 60 degrees and has a refractive index of 1.5. What is the angle of minimum deviation?
  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 15 degrees

Questions & Step-by-Step Solutions

A beam of light passes through a prism with an angle of 60 degrees and has a refractive index of 1.5. What is the angle of minimum deviation?
  • Step 1: Understand that a prism bends light. The angle of the prism is given as 60 degrees.
  • Step 2: Know that the angle of minimum deviation (D) is the angle at which light passes through the prism with the least bending.
  • Step 3: For small angles, the angle of minimum deviation (D) can be approximated to be equal to the angle of the prism (A).
  • Step 4: Since the angle of the prism (A) is 60 degrees, we can say that the angle of minimum deviation (D) is also approximately 60 degrees.
  • Refraction – The bending of light as it passes through different media, governed by Snell's law.
  • Prism Geometry – Understanding the relationship between the angle of the prism, the angle of incidence, and the angle of refraction.
  • Angle of Minimum Deviation – The smallest angle at which light can pass through a prism, which occurs when the light enters and exits symmetrically.
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