Fish Eye

FISH EYE employs the theory of the critical angle of refraction to inspect a fly from a fish’s point of view. The image on the slanted mirror, seen as in figure A, is that of a fly within a fish’s window. If you look at the image on the mirror as in figure B, you get the vision of the fly outside the fish’s window. This is because full reflection occurs on the virtual water surface to create secondary reflection image as the incident angle exceeds the critical angle of refraction