Refractive Index - Part 2 - The Disappearing Beaker

The video demonstrates the concept of refractive index through an experiment. It begins with an introduction and reference to a previous video for more details. The materials needed are vegetable oil, a large beaker, a small beaker, and a glass stirring rod. The experiment is safe, requiring no protective gear. A control is established using water to observe the glass stirring rod. The main experiment shows how the glass appears to disappear in vegetable oil due to similar refractive indices. The video concludes with observations on how light travels through substances with similar refractive indices, making objects appear invisible.

Explain why the glass stirring rod seems to disappear in vegetable oil.

What observation can be made about the small beaker in the large beaker filled with vegetable oil?