Wave length of red light is close to 700 nm.
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blue= 450-495
violet= 380-450
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Red light with wavelength 700 nm is passed through a two-slit apparatus. At the same time, monochromatic visible light with another wavelength passes through the same apparatus. As a result, most of the pattern that appears on the screen is a mixture of two colors; however, the center of the third bright fringe (m = 3) of the red light appears pure red, with none of the other color
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