I noticed this interesting phenomenon in real life, so I had to replicate
it with POV-Ray. It simulated the effect beautifully.

  There are two identical glasses in the image, both of which have a paper
label around them. The glass on the left is empty, and the glass on the
right is partially filled with water. Even though the water is very
transparent, it nevertheless completely blocks the paper label from view.

  This is caused by total internal reflection. And it happens in the same
way in real life.

Post a reply to this message

Attachments:
Download 'TotalInternalReflectionDemo.jpg' (81 KB)

Preview of image 'TotalInternalReflectionDemo.jpg'