In YDSE, if a bichromatic light having wavelengths λ₁ and λ₂ is used, then the maxima due to both lights will overlap at a certain distance y of from the central maxima. Take separation between slits as d and distance between screen and slit as D. Then, the value y will be

a. (λ₁ + λ₂2D)d
b. λ₁ + λ₂/2Dx2D
c. LCM of λ₁D/d and λ₂D/d
d. HCF of λ₁D/d and λ₂D/d