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A beam of light enters a prism with an angle of 60 degrees. If the refractive in

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Question: A beam of light enters a prism with an angle of 60 degrees. If the refractive index of the prism is 1.5, what is the angle of refraction inside the prism?

Options:

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

Correct Answer: 30 degrees

Solution: 

Using Snell\'s law, sin(θ2) = sin(60)/1.5, we find θ2 = 30 degrees.

A beam of light enters a prism with an angle of 60 degrees. If the refractive in

Practice Questions

Q1
A beam of light enters a prism with an angle of 60 degrees. If the refractive index of the prism is 1.5, what is the angle of refraction inside the prism?
  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 90 degrees

Questions & Step-by-Step Solutions

A beam of light enters a prism with an angle of 60 degrees. If the refractive index of the prism is 1.5, what is the angle of refraction inside the prism?
  • Step 1: Understand that when light enters a new medium (like a prism), it bends. This bending is described by Snell's law.
  • Step 2: Snell's law states that n1 * sin(θ1) = n2 * sin(θ2), where n is the refractive index and θ is the angle.
  • Step 3: In this case, the light is entering the prism from air. The refractive index of air (n1) is approximately 1.0, and the refractive index of the prism (n2) is 1.5.
  • Step 4: The angle of incidence (θ1) is given as 60 degrees.
  • Step 5: Plug the values into Snell's law: 1.0 * sin(60 degrees) = 1.5 * sin(θ2).
  • Step 6: Calculate sin(60 degrees), which is √3/2 or approximately 0.866.
  • Step 7: Rewrite the equation: 0.866 = 1.5 * sin(θ2).
  • Step 8: To find sin(θ2), divide both sides by 1.5: sin(θ2) = 0.866 / 1.5.
  • Step 9: Calculate 0.866 / 1.5, which is approximately 0.577.
  • Step 10: Now, find θ2 by taking the inverse sine (arcsin) of 0.577, which gives approximately 30 degrees.
  • Refraction – The bending of light as it passes from one medium to another, described by Snell's law.
  • Snell's Law – A formula used to describe the relationship between the angles of incidence and refraction when light passes between two different media.
  • Refractive Index – A dimensionless number that describes how fast light travels in a medium compared to vacuum.
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