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Two slits S(1) and S(2) illuminated by a...

Two slits `S_(1)` and `S_(2)` illuminated by a white light source give a white central maxima. A transparent sheet of refractive index 1.25 and thickness `t_(1)` is placed in front of `S_(1)`. Another transparent sheet of refractive index 1.50 and thickness `t_(2)` is placed in front of `S_(2)`. If central maxima is not effected, then ratio of the thickness of the two sheets will be :

A

`1:2`

B

`2:1`

C

`1:4`

D

`4:1`

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The correct Answer is:
B
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