Lesson Plan: The Dispersive Power of a Prism Physics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to calculate the dispersive power of a prism given the refractive indices of the different colors of light passing through it.

Objectives

Students will be able to

  • recognize that the shorter the wavelength of light, the greater its deviation by a prism,
  • use the formula 𝜔=𝛼𝛼minmaxminmax to relate the dispersive power of a prism to the angles of deviation of different wavelengths of light passing through it,
  • use the formula 𝜔=𝑛𝑛1minmaxminmax to relate the dispersive power of a prism to the refractive indexes for the different wavelengths of light passing through it.

Prerequisites

Students should already be familiar with

  • deviation by prisms,
  • dispersion.

Exclusions

Students will not cover

  • calculations of deviation angles.

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