A Young's double-slit arrangement with slits S₁ and S₂ is immersed in water of refractive index 4/3 as shown. The maxima on the water surface satisfy x²=p²m²λ²-d², where λ is the wavelength in air, 2d is slit separation and m is an integer. Find p.

Question

G1 Physics · Accepted Answer

Apply the YDSE path-difference condition on the water surface using refractive index 4/3. Comparing the resulting equation with x²=p²m²λ²-d² gives p=3.