A thin glass rod is submerged in oil. What is the critical angle for light traveling inside the rod?
The critical angle for light traveling inside the rod is
The boundary prevents the ray from refracting. Instead, all of the light reflects back into the prism from the boundary. This is known as total internal reflection, or TIR for short.
A critical angle is reached when. Because, Snell’s lawgives the critical angle of incidence as
Equation that yields the critical angle for light travelling inside the rod is,
Substitute the Values:
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