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Sir pls solve this question.

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Asked by rsudipto 12th December 2018, 9:41 AM
Answered by Expert
Answer:
Fringe width = Dλ/d  ........................ (1)
where D is distance between slits and screen, λ is the wavelength of the light used and d is the inter-slit distance.
 
Shifting of fringe pattern due to mica sheet = t(μ-1)D/d ............(2)
where t is the thickness of mica sheet and μ is the refractive index of mica
 
since shifting is one fringe spacing , let us equate (1) and (2) to get refractive index
 
begin mathsize 12px style fraction numerator t open parentheses mu minus 1 close parentheses D over denominator d end fraction space equals space D over d lambda space space space space o r space space space space space space space t open parentheses mu minus 1 close parentheses space equals space lambda
mu space equals space lambda over t plus 1 space equals space fraction numerator 6000 cross times 10 to the power of negative 10 end exponent over denominator 8 cross times 10 to the power of negative 7 end exponent end fraction plus 1 space equals space 1.75 end style
Answered by Expert 13th December 2018, 9:41 AM
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