A double slit experiment is performed with light of \( \mathrm{P} \) wavelength \( 500 \mathrm{~...
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A double slit experiment is performed with light of
\( \mathrm{P} \) wavelength \( 500 \mathrm{~nm} \). A thin film of thickness \( 2 \mu \mathrm{m} \)
W and refractive index \( 1.5 \) is introduced in the path of the upper beam. The location of the central maximum will :
(1) Remain unshifted
(2) Shift downward by nearly two fringes
(3) Shift upward by nearly two fringes
(4) Shift downward by 10 fringes
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