On replacing a thin film of mica of thickness 12 × 1 0 − 5 cm in the path of one of the interfering beams in Young's double slit experiment using monochromatic light, the fringe pattern shifts th

Question

On replacing a thin film of mica of thickness 12 × 1 0 − 5 cm in the path of one of the interfering beams in Young's double slit experiment using monochromatic light, the fringe pattern shifts through a distance equal to the width of bright fringe. If λ = 6 × 1 0 − 5 cm , the refractive index of mica is

TestHub · Accepted Answer

The equation for the shift in the fringe pattern is given as, n λ = ( μ − 1 ) t ∴ Refractive index of mica is: ∴ ∴ ​ μ = t n λ ​ + 1 μ = 12 × 1 0 − 5 1 × 6 × 1 0 − 5 ​ + 1 = 0.5 + 1 μ = 1.5 ​

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