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A two slit Young's interference experime...

A two slit Young's interference experiment it 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 if found that the interference pattern shifts by `5 mm`. The refractive index of the transparent plate is :

A

`1.2`

B

`1.5`

C

`1.8`

D

`4//3`

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The correct Answer is:
A
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