Why a low focal length convex lens is used in wavelength determination of sodium light?
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High-pressure sodium lamps produce a broader spectrum of light than the low-pressure lamps, but they still have poorer color rendering than other types of lamps. Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night hence so low focal length convex lens is used in wavelength determination of sodium light as it's is monochromatic light
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The focal length of a convex lens increases as the wavelength increases. This is so because the refractive index decreases with an increase in wavelength of light.
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