How can we derive smells law ?
Hello Eswara,
I think you meant snell's law for refraction which states - The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media.
You can derive the law using fermat's principle of light.
Full derivation here - https://byjus.com/snells-law-formula/
Hope this helps.