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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: prism problem...rates assured........
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[Post New]6 Apr 2008 21:14:38 IST
    Subject: prism problem...rates assured........
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srivathsan.v (96)

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One face of a prism is silver polished. A light ray falls at an angle of  45o on the other face. After refraction, it is subsequently reflected from silver face and then retraverses its path. The angle of the prism is 30o. What is its refractive index?
    
[Post New]6 Apr 2008 21:18:44 IST
    Subject: Re:prism problem...rates assured........
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srini (305)

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Hey
If it has to retrace it has to hit normally which means by geometry, r=60...
Therefore,
 refractive index=root6.
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[Post New]6 Apr 2008 21:29:54 IST
    Subject: prism problem...rates assured........
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rtiit (431)

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is the answer root2???

tell me if m rite or not..

i'll post the solution.......
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[Post New]6 Apr 2008 21:38:23 IST
    Subject: prism problem...rates assured........
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rtiit (431)

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hey plz reply if m rite..............
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[Post New]12 Apr 2008 07:13:52 IST
    Subject: prism problem...rates assured........
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srivathsan.v (96)

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tanny you are right
how did you get the answer
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[Post New]12 Apr 2008 07:30:24 IST
    Subject: Re:prism problem...rates assured........
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rakesh61 (1869)

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see to retrace its path the refracted ray has to fall perpendicular to the the 2 nd surface
 
 
so as per figure to get mew
 
we use snell law on first surface sin 45 / sin 30 and we get root over 2 which is the ans
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