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A double slit experiment is performed wi...

A double slit experiment is performed with light of wavelength `500nm`. A thin film of thickness `2mum` and refractive index `1.5` is introduced in the path of the upper beam. The location of the central maximum will

A

(a) Remain unshifted

B

(b) Shift downward by nearly two fringes

C

(c) Shift upward by nearly two fringes

D

(d) Shift downward by 10 fringes

Text Solution

Verified by Experts

The correct Answer is:
C
If shift is equal to n fringes width, then
`n=((mu-1)t)/(lambda)=((1.5-1)xx2xx10^-6)/(500xx10^-9)=(1)/(500)xx10^3=2`
Since a thin film is introduced in upper beam. So shift will be upward.
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Knowledge Check

  • A double slit experiment is performed with light of wavelength 500 nm A thin film of thickness 2 mu m and refractive index 1.5 is introduced in the path of the upper beam the location of the central maximum will

    A
    remain unshifted
    B
    shift downward by nearly two fringes
    C
    shift upward by nearly two fringes
    D
    shift downward by its fringes

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    remain unshifted
    B
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