Abstract
A functional monochromator model in a cardboard box, made from rotatable grating using a digital versatile disk is described to highlight the working principles of a UV-Vis monochromator. The light source is a bright white LED and the colored bands from the exit are displayed on the screen. The concept of absorption, complementary color, excitation and fluorescence, flame emission spectrum, and wavelength dependence of light scattering can be visually shown in this model. With a minor modification, one can use the same box to monitor flame emission spectrum of sodium and different light sources. As an optional activity, the same properties are observed on a scanning spectrophotometer.
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