Question

Why do diving birds dive straight down to catch the fish

Answer 1

When a bird dives into the water at a ninety-degree angle after flying vertically over the position of a fish, its apparent location appears to be exactly where the bird's true location is. This is because light enters a second medium with an incident beam that is perpendicular (i.e., up to normal) to the boundary of the first medium. The idea is that since normal rays do not refract, the fish appears to remain exactly where it is, even though its actual location is different.

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Answer 2

This is because of birds perceive the idea of refraction of sunlight instinctively.

In general, the additional optically dense the medium, the slower the sunlight can move Light changes direction . however wherever the incident beam is perpendicular to the boundary (that is, up to the normal), there's no modification within the direction of the sunshine because it enters the second medium.

The bird flies vertically over the position of the fish, so dives into the water at a ninety Degree angle. The idea here is that the commonly incident rays don't bear refraction, thence the fish lies specifically wherever it seems to be. At the other angle, the apparent location of the fish would diverge from its real location.