Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8 ^ th bright fringe in the medium lies where 5 ^ th dark fringe lies in air. The refractive index of the

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Correct answer: D. 1.78

In air distance of 5 ^ th dark fringe is y _ 1 y _ 1 = y _ 5 ^ th dark = (2 × 5 - 1)( )/(2d) = (9 )/(2d) Also, the distance of 8 ^ th bright fringe in the medium is y _ 2 = y _ 8 ^ th Bright = 8( )/( ) y _ 1 = y _ 2 (according to question) (9)/(2)( )/(d) = 8( )/( ) μ = (16)/(9) = 1.78

Young's double slit experiment is first performed in air and then...

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