The figure shows a double slit located a distance x = 2.85 m from a screen, with the distance from the center of the screen to a bright fringe given by y. When the distance d between the slits is large compared to the wavelength λ, there will be numerous such bright fringes. Part (a)  Give an expression for the distance between adjacent fringes Δy, using quantities given in the problem statement and assuming the angles θ are very small.   Part (b)  Calculate the distance between adjacent fringes, in centimeters, for 638-nm light falling on double slits separated by 0.0815 mm.

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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.