Lesson Worksheet: Deviation due to a Prism Physics

In this worksheet, we will practice determining the effect of the shape and refractive index of a prism on the path taken through it by light rays.

Q1:

A triangular prism has an apex angle of 77. Given that the angle of minimum deviation is 44 and light rays deviate least through the prism at an angle of incidence of 44, find the refractive index of the prism to 2 decimal places.

Q2:

A triangular prism produces a minimum angle of deviation of light rays through it when the angle of incidence of light rays onto the prism is 44. The minimum angle of deviation of the prism is 28. What is the apex angle of the prism? Answer to the nearest degree.

Q3:

A very thin triangular prism has an apex angle of 2.8. The refractive index of the prism is 1.4. Find the minimum angle of deviation produced by the prism using the small-angle approximation. Answer to one decimal place.

Q4:

A very thin triangular prism has an apex angle of 2.5. The minimum deviation angle through the prism is 1.4. Find the refractive index of the prism using the small-angle approximation. Answer to one decimal place.

Q5:

A triangular prism has an apex angle of 48. The prism produces a minimum angle of deviation of light rays through it when the angle of incidence of light rays onto the prism is 36. What is the minimum angle of deviation of the prism? Answer to the nearest degree.

Q6:

The diagram shows the path of a light ray through a triangular prism. The apex angle of the prism 𝜃=40. What is the angle Φ? Answer to the nearest degree.

Q7:

The graph shows how the angle of deviation of the triangular prism shown in the diagram varies with the angle of incidence of light rays on it.

Where 𝛼, the angle of deviation, has its minimum value, which of the angles in the diagram is equal to the angle Φ?

  • A𝐴
  • B𝛼
  • CΦ
  • D𝜃
  • E𝜃

Where 𝛼, the angle of deviation, has its minimum value, which of the angles in the diagram is equal to the angle 𝜃?

  • A𝜃
  • B𝐴
  • CΦ
  • D𝛼
  • EΦ

Q8:

The diagram shows the path of a light ray through a triangular prism. What is the sum of the angles 𝑎 and 𝑏?

Q9:

The diagram shows the path of a light ray through a triangular prism. Which of the following correctly relates the apex angle of the prism 𝐴 to the angles of incidence and the angles of refraction of the incident and emergent rays shown?

  • A180(𝜃+Φ)=𝐴
  • BΦ+𝜃=𝐴
  • CΦ+Φ=𝐴
  • D𝜃+𝜃=𝐴
  • E𝜃+Φ=𝐴

Q10:

A triangular prism has an apex angle of 45. The minimum angle of deviation of the prism is 55. What is the angle of incidence that corresponds to this angle of deviation? Answer to the nearest degree.

This lesson includes 53 additional questions and 32 additional question variations for subscribers.

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