A two slit Young's interference experiment is done with monochromatic light of wavelength 6000 A. The slits are 2 mm apart. The fringes are observed on a screen placed 10 cm away from the slits. Now a transparent plate of thickness 0.5 mm is placed in front of one of the slits and it is found that the interference pattern shifts by 5 mm . The refractive index of the transparent plate is(A) 1.2(B) 0.6(C) 2.4(D) 1.5

A two slit Young's interference experiment is done with monochromatic

1.	A two slit Young's interference experiment is done with monochromatic light of wavelength 6000 A. The slits are 2 mm apart. The fringes are observed on a screen placed 10 cm away from the slits. Now a transparent plate of thickness 0.5 mm is placed in front of one of the slits and it is found that the interference pattern shifts by 5 mm . The refractive index of the transparent plate is(A) 1.2(B) 0.6(C) 2.4(D) 1.5
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