5. Two ideal slits S, and S, are at a distance 'd apart and illuminated by light of wavelength a coming from ideal source slit S. Source slit S is placed in front of slit S. The distance between the plane of slits and source slit is D. A screen is held at a distance D from the plane of slits S, and S, as shown in the figure. Minimum value of d for which there is darkness on the screen at point o infront of slit S, is (d << D) Screen S.......... LES CODES . koto (1) 14 a 320 (2) VAD (4) 1390