Refraction Simulation
To run this simulation enter values for the angle of incidence and the refractive index index of the medium into the respective boxes and then click on a button. Try 30 degrees and an index of 1.5 and then increment,
(that is make small changes in) either value. At certain angles you will observe total internal reflection (TIR).
Can you see any connection between the smallest angle at which TIR first occurs (the critical angle), and the index? What is the critical angle for Lucite (n=1.50) and diamond (n=2.42)?
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