Posted by **Tina** on Wednesday, July 13, 2011 at 8:36pm.

A ray of light enters the top of a glass of water at an angle of 36 degrees with the vertical. What is the angle between the refracted ray and vertical?

The answer is 26 degrees but I keep getting 22 degrees.

I used snell's law: n1sinθ1=n2sinθ2

for n1 I thought it would be air: n=1.00

θ1=36 degrees

I thought n2 would be the water so n=1.33

and θ2 is what I am trying to find. When I plug everything in I get 22. So what am I doing wrong?

Am I using the wrong n values?

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