Consider the sodium doublet vapor lines, which have wavelengths of 589 nm (line a) and 589.6 nm (line b).  (a)  Find the angle (in degrees) between the first minima for the two sodium vapor lines, when they fall upon a single slit with a width of 1.8 μm.  (b)  What is the distance in mm between these minima if the diffraction pattern falls on a screen 1.05 m from the slit?

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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.