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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 thichkness `t_(1)` is placed in from 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 affected, then the ratio `t_(1):t_(2)` 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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