Lesson Plan: Deviation due to a Prism Physics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to determine the effect of the shape and refractive index of a prism on the path taken through it by light rays.


Students will be able to

  • diagrammatically derive and apply the formula for deviation, 𝛼=πœ™+πœƒβˆ’π΄οŠ§οŠ¨,
  • graphically demonstrate and use the formula for minimum deviation incidence angle, πœ™=(𝛼+𝐴)2,
  • use the thin prism approximation formula, 𝑛=(𝛼+𝐴)𝐴.


Students should already be familiar with

  • Snell’s law.


Students will not cover

  • dispersion.

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