Derivation of relation between apparent depth and real depth in a liquid • HERO OF THE DERIVATIONS.

[@HamidOumimoune-sb6zq]

Thanks sir, but I think we can use tan(i) and tan(r), without using the approximation that the rays OA an OB are very close to each other, to establish this formula.

[@heroofthederivations7305]

Yes. But Snell's law has sine that's why we began with sine then replaced it with tan.

[@HamidOumimoune-sb6zq]

@heroofthederivations7305 thanks for this clarification.