In the two-slit experiment , let angle u be 20.0°, the slit separation be 4.24 mm, and the wavelength be l=500 nm. (a) What multiple of l gives the phase difference between the waves of rays r1 and r2 when they arrive at point P on the distant screen? (b) What is the phase difference in radians? (c) Determine where in the interference pattern point P lies by giving the maximum or minimum on which it lies,or the maximum and minimum between which it lies.

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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.