Two transparent slabs of equal thickness but different refractive indices and are…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Two transparent slabs of equal thickness but different refractive indices μ1\mu_1 and μ2\mu_2 are pasted side by side to form a composite slab. This slab is placed just after the double slit in Young's experiment, so that light from one slit goes through one material and light from the other slit goes through the other material. What is the minimum thickness of the slab so that there is a minimum at the point P0P_0, which is equidistant from the slits? (a) 2λμ1−μ2\frac{2\lambda}{\mu_1-\mu_2} (b) λ4(μ1−μ2)\frac{\lambda}{4(\mu_1-\mu_2)} (c) λμ1−μ2\frac{\lambda}{\mu_1-\mu_2} (d) λ2∣μ1−μ2∣\frac{\lambda}{2|\mu_1-\mu_2|}

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