# Total internal reflection

1. May 26, 2015

### jack edison

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
glass is more dense than air, so the ray will go towards the normal. I know that when it meets the normal, it totally internally reflects, (after looking at the answer), but how do you know? TIR only happens when a ray is going from a medium with higher refractive index to a medium with a lower refractive index, but that does not mean it is necessarily going to happen. I know what the critical angle is, but not the incident angle, so I can't tell if the incident angle is > the critical angle, in which case TIR would happen.

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2. May 26, 2015

### ehild

You should know the refractive indices those of oil, water, and glass to figure out where can TIR occur.

Last edited: May 26, 2015
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