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Double slit interference and single slit diffraction ...

Brooklyn College 1 Double slit interference and single slit diffraction Purpose 1. Study Double slit interference of light waves 2. Study single slit diffraction of light Introduction When a monochromatic and coherent light passes through a single or Double slit, it creates a diffraction / interference pattern on a screen placed beyond the slits. The pattern formed is because of the superposition of the waves coming from the slit (or two slits). Double slit interference Figure 1 shows a configuration for Double slit interference experiment. Monochromatic and coherent light such as laser is incident on two narrow slits, S1 and S2. These two slits act as two coherent sources of spherical waves of the same wavelength. These waves interfere to form interference pattern on a distant screen. interference pattern due to a Double slit will have dark and bright fringes due to destructive and constructive interference of the waves coming from the two slits. Let l is the wavelength of the light, d is the slit separation, W is the width of the slits, L is distance from the slits to the screen, O is the center point on the screen opposite to the slits.

Interference pattern due to a double slit will have dark and bright fringes due to destructive and constructive interference of the waves coming from the two slits. Let l is the wavelength of the light, d is the slit separation, W is the width of the slits, L is distance from

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