👉 Pleochroism is a type of optical phenomenon in which light appears to have three colors, with each color appearing at different wavelengths. This effect was first observed by Johann Heinrich Lambert in 1776 and has since been extensively studied. In Plechromorphism, the light source is not fixed; it changes its position or orientation from one point to another, causing the light to appear to have three colors at different wavelengths. The colors are typically red, green, and blue