Physics Help Forum Glass Slab question

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 Dec 14th 2008, 07:51 AM #1 Junior Member   Join Date: Dec 2008 Posts: 16 Glass Slab question The velocity of light in a medium is 2 * 10^8 m/s. A ray of light is incident at the interface of the medium on the optically denser side at 30◦ . What is the angle for refraction ? Now, I'm confused..is it possible to find this answer? THe abosolute refractive index is not given, we could apply snell's law but we get 2 variables, and we I can't seem to get simultaneous equations.. please help. EDIT: THIS IS NOT A GLASS SLAB QUESTION, SORRY FOR MY TITLE!!! Last edited by ice_syncer; Dec 14th 2008 at 08:22 AM. Reason: Becasue THIS IS NOT A GLASS SLAB QUESTION, SORRY FOR MY TITLE!!!
Dec 14th 2008, 08:21 AM   #2
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Join Date: Dec 2008
Posts: 16
 Originally Posted by flyingsquirrel Hi, Can't you use this : to get the refractive index ?
That will only give the absolute refractive index(with respect to air , yeah we can use 3*10^8 for that..), not with respect to the other medium.. Please shjow the steps also.

 Dec 15th 2008, 12:57 PM #3 Member   Join Date: Dec 2008 Posts: 65 The index of refraction is the ration between the speed in air (vacuum) and the speed in the medium. Here n=3x10^8/2x10^8=1.5 (ordinary glass) I will assume that the light goes from glass to air if the problem does not specify the second medium.

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