Hello applicant,

You can derive snells law of refraction using Fermat's principle.

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It's derivation is easily available on internet ,YouTube and Google through notes and videos.

You can consider byjus video for it derivation and also you can read the full article of it's derivation from the notes on the internet.

Hope it helps.

Hello Eswara,

You can derive snells law using Fermat's principle which states - light travels in the shortest path that takes the least time.

You can visit the link below for the full deivation - https://byjus.com/snells-law-formula/

Hope this helps.