Yes, you are correct. The critical angle will change depending on the
difference in light speed between the two materials the light is
traveling through. 49 degrees is the critical angle when the two
materials are air and water. If different materials are used, the
critical angle will be different.
> I liked your critical angle snack. But I have a question. Does critical angle
> change by substance? Would it be different in plastic, or would it remain 49
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