Lesson: Critical Angle for Total Internal Reflection Physics • Second Year of Secondary School

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In this lesson, we will learn how to relate the paths of refracted and internally reflected light rays to the refractive indices of media they travel in.

Lesson Plan

Students will be able to

calculate , the critical angle for light rays traveling in a medium of refractive index at a boundary with a medium of refractive index , using , where ,
rearrange to determine unknown refractive indices,
interpret diagrams of light rays taking different paths to infer the relations between incident and refracted angles and between the refractive indices of media.