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A ray enters a glass sphere which has one of its sides silvered. It emerges from the sphere after 1 reflection from the silvered surface. In this process, the ray suffers some deviation. The deviation angle is found to be minimum at i=60 degrees.

What is the refractive index of the glass correct upto 3 places of decimal?
Note: You can check your answer using the judge on the left

8 comments:

  1. AmitApril 20, 2011 at 12:05 PM

    This comment has been removed by the author.

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  2. Ankush SachdevaApril 20, 2011 at 1:02 PM

    This comment has been removed by a blog administrator.

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  3. ShivankerApril 20, 2011 at 4:51 PM

    @Ankush: that lands one up onto cheating one's own self.. :)

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  4. Ankush SachdevaApril 20, 2011 at 7:11 PM

    i actually got the correct answer ,before i found this........i was just making the admin aware of this fact

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  5. AnujApril 20, 2011 at 10:25 PM

    alright...lets just focus on the question at hand.

    ReplyDelete
  6. shaanApril 23, 2011 at 9:08 PM

    please help me in this..

    i did
    daviation= 180 + 2i-4r ..(1) [u can see this by finding daviation at each surface]

    also, sin i/sin r= U{mew}..(2)
    put 2 in 1 , take derivative =0,
    i'm getting
    U= sin 60= .866 ..which seems absurd..

    please help..

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  7. shaanApril 27, 2011 at 1:08 AM

    please help.

    ReplyDelete
  8. mayankApril 27, 2011 at 11:03 AM

    method is correct, check again your calculations.
    sin60=root(3)/2. You have to substitute value of r and take derivative of deviation wrt i.May be you are taking derivative of sin(inverse) wrong

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