While a narrow light beam is aimed at single slit, the light goes through one slit and hits the screen and creates a single light streak, when the light is aimed at two slits, the light goes through two slits and the light on the screen spreads out into many blobs of light (the size of the blobs becomes wider towards the sides.) in other words, two light waves overwraps to create an interference pattern.
Reference: Dr. Quantum -Double Slit Experiment, Young's Two-slit Experiments
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