Coherent light consisting of two wavelengths λ1=4500A0  and λ2=6000A0  is sent through both slits of a Young’s double slit apparatus. Then

Central Bright fringe position has zero path differencenλ2Dd=mλ1Dd⇒3λ2=4λ1⇒λ1λ2=34B) Coincidence of darks takes place only if λ1λ2 = ratio of odd integers. But here λ1λ2=34