Pass linearly polarised white light through a column of sugar solution. When transmitted light is observed through a polariser it may appear coloured. Rotate the polariser, and the transmitted light colour may change. Construct such a sweet monochromator and optimise for the narrowest light wavelength bandwidth.

使线偏振白光通过蔗糖溶液柱。当透过偏振片观察透射光时，可能呈现彩色；旋转偏振片，透射光的颜色可能改变。构建此类“蔗糖单色仪”，并优化以获得最窄的光波长带宽。