In a double slit experiment, the wavelength λ of the light source is 405 nm, the slit separation d is 19.44 mm, and the slit width a is 4.050 mm. Consider the interference of the light from the two slits and also the diffraction of the light through each slit. (a)How many bright interference fringes are within the central peak of the diffraction envelope? (b) How many bright fringes are within either of the first side peaks of the diffraction envelope?

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.