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A double slit experiment is performed with light of wavelength 500 nm. A thin film

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

Options

(a) Remain unshifted
(b) Shift downward by nearly two fringes
(c) Shift upward by nearly two fringes
(d) Shift downward by 10 fringes

Correct Answer:

Shift upward by nearly two fringes

Explanation:

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