Physics Help Forum Conceptual light reflect/refraction problem

 Light and Optics Light and Optics Physics Help Forum

 Mar 22nd 2009, 11:02 AM #1 Junior Member   Join Date: Sep 2008 Posts: 4 Conceptual light reflect/refraction problem Alright, so, i think i get everything in the chapter on light and reflection/refraction. But, one question gets me. I think its because im not understanding the question correctly, but ive tried working backwards and i still dont get the right answer. ok here it is: To a submerged diver looking upward through the water, the altitude of the Sun (the angle between the Sun and the horizon) appears to be 45* (*=degrees). The actual altitude of the Sun is greater than, less than, or equal to 45*? explain. and lastly, What is the Sun's actual altitude? Thanks in advance i need help on this one...
 Mar 22nd 2009, 12:03 PM #2 Physics Team   Join Date: Feb 2009 Location: India Posts: 365 See the attachment. Light comming from the sun S bends towards the normal after refraction and appears to come from S'. I t is clear from the fig that Actual altitude of the sun is less than the apparent. For the second part use snell's law n = sini/sinr. n is the refractive index of the water. In your case n= {sin (90-x)}/sin45 ,Put the vlue of n and find x, the actual altitude.
 Mar 22nd 2009, 12:38 PM #3 Junior Member   Join Date: Sep 2008 Posts: 4 what attachment?
 Mar 22nd 2009, 12:48 PM #4 Physics Team   Join Date: Feb 2009 Location: India Posts: 365 Some problem appears there in my computer. I Tried many times but could not attach the file. Any way, I am trying to explain withought that. let x be the actual altitude of the sun. its angle of incedence (angle with the normal) will be (90-x). This ray bends towards the normal and makes an angle of refraction = 45 degree. This ray on extending backward gives the apparent altitude of the sun. Hence n= sin(90-x)/sin45 Last edited by Parvez; Mar 22nd 2009 at 09:52 PM.
 Mar 22nd 2009, 10:26 PM #5 Physics Team   Join Date: Feb 2009 Location: India Posts: 365 Here is the attachment. Last edited by Parvez; Apr 28th 2009 at 10:38 PM.

### conceptual refraction problems

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