Physics Help Forum reflection and refraction

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 Jan 11th 2012, 09:37 PM #1 Junior Member   Join Date: Jan 2012 Posts: 13 reflection and refraction Hi! So this is a question from reflection and refraction, and I have to find angle deta Last edited by Koko; Jan 24th 2012 at 01:23 PM.
 Jan 12th 2012, 08:38 AM #2 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 If the light goes from one medium to another without bending, then it is entering that latter medium at a right angles. That said, without knowing the angles of the rectangle formed by the prisms, I don't think there is a single solution... __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?
 Jan 12th 2012, 06:59 PM #3 Junior Member   Join Date: Jan 2012 Posts: 13 If this helps the answers are angle deta 1 = 44 degrees and angle deta 2 = 53 degrees. I'm currently trying to work it out backwords... hey but can you explain me this thing to why when the light's not changing direction it's going to another medium in 90 degrees?
 Jan 13th 2012, 07:58 AM #4 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 Isn't that not obvious? The angle of incidence is zero, so will be the angle of refraction. From a formula standpoint, we know that: sin i / sin r = n If i = 0, then sin i = 0. Whatever be n, , sin r will equal to 0, which means that r will always be 0. Coming back to the original question, aren't you asked to find delta 1 and delta 4? What is the exact question anyway? Did you do an experiment? __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?
 Jan 13th 2012, 09:51 AM #5 Junior Member   Join Date: Jan 2012 Posts: 13 Okay, so yea I'm suppose to find angle deta 1 and 4 but I do have the answers and that's why I brought them up. Cuz sometimes I work backwards with the answer to find out the process. And it wasn't an experiment and all the info that was given was the drawing plus the fact that light does not bend as it changes medium.
 Jan 13th 2012, 10:31 PM #6 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 Well, if the diagram is good, then we get theta 2 = 30 degrees. This said, we get: sin i/sin r = 1.4 Giving i = 44.42 degrees, which is 44 to 2 sf. So, I guess the rectangle is 90 degrees all around... __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?
 Jan 14th 2012, 06:46 PM #7 Junior Member   Join Date: Jan 2012 Posts: 13 I'm just assuming that my teacher forgot to make it clear that it's a rectangle.. cuz it seems like there's no way it would work out unless we know that. So I did get the answer and the process as well. Thank you very much!
 Feb 10th 2012, 09:46 AM #8 Member   Join Date: Nov 2008 Location: PAKISTAN Posts: 79 Hi, refractive index can be found in many cases. certainly light passing from lighter to denser medium.i.e. n = sini/sinr=velocity of light in air or vaccum/ velocity of light in denser medium= 1/sinc(where c is a critical angle= real depth of denser medium/ apparent depth. these are all formula for refractive index, check out which one is applicable to your question. anwaar

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