Refractive Index - Part 4 - The Disappearing Penny Trick

The video demonstrates an experiment to highlight the refractive index using a penny, a glass, and water. It explains how light bending makes the penny appear to disappear and reappear, referencing a previous video for further explanation. The experiment is safe and requires no protective gear. Observations show the penny's apparent movement due to light refraction.

What new insight or understanding did you gain from this video?