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IIT-JEE 2009

optics (Discussion)

Rahul porwal said – Thu, 05 Nov 2009 07:35:57 -0000 ( Edit Link )

if a ray of light is incident perpendicularly on a denser medium it passes without any refraction. on applying snells law it gives n=sini/sinr=sin0/sin0=0/0.???? how is it posible? wat does this mean? can any medium have its refrative index = infinity??

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Author: Rahul porwal; Authority 33

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ambarish parasar said – Thu, 05 Nov 2009 16:58:12 -0000 ( Flag Edit Mark / Unmark Best Link )

Dis is only a special case. A medium wud hav refractive index as infinity if for every angle of incidence, the angle of refraction is 0. However let me ask u a question. Dis case is true for any medium. does it mean all medium hav same refractiv index??? moreover 0/0 is any random real number and not necessarily infinity.
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1. rkroks said – Sun, 08 Nov 2009 17:41:25 -0000 ( Flag Edit Link )
  
  dude 0/0 is indeterminate limit form…
  
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rkroks said – Sun, 08 Nov 2009 17:39:20 -0000 ( Flag Edit Mark / Unmark Best Link )

dear sin i/sinr gives 0/0 form on applying limits i-~~>0& r~~->0 u get i/r which is refractive index u r looking for
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1. Rahul porwal said – Mon, 09 Nov 2009 09:05:02 -0000 ( Flag Edit Link )
  
  but i/r is again 0/0. as they are the angle that incident or reflected ray make wid the normal. when they are along the normal their angle wid normal itself is zero
  
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