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Old Feb 14th 2010, 05:12 PM   #1
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Find angle of refraction

Light in air is incident on a glass surface at 30. If the refractive index is 1 .55 find the angle of refraction. Explain what is meant by the critical angle and calculate it for this glass.
Stuck on this.
Help please
Thanks
c= 3x10^8 ms

Last edited by George321; Feb 14th 2010 at 05:40 PM.
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Old Feb 15th 2010, 12:01 AM   #2
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Hi George

1. Do you know about Snell's law?
2. Critical angle is the angle of incidence where the angle of refraction = 90 degrees.
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Old Feb 15th 2010, 01:57 PM   #3
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nooo i don't, we've been ask to find out a load of stuff on the internet and my physics teacher reccomended me to th site.
Please explain???
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Old Feb 22nd 2010, 12:39 AM   #4
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Snell's law :

n1 sin θ1 = n2 sin θ2 , (1 = medium where the light comes and 2 = medium where the light refracted).

Read about snell's law and critical angle (maybe from the site that is recommended from your teacher or just googling) to get the basic of it.

Now can you solve your problem?
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angle, critical angle, find, glass, light, refraction, refractive index



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