Bending Light

The video explains how light travels at different speeds in various mediums, such as air and water, due to differences in density. It introduces the concept of refraction, where light changes speed and direction when moving between mediums. This phenomenon is demonstrated with a laser and a tank of water. The video also discusses how refraction occurs in the human eye, focusing light on the retina. It explains vision issues like nearsightedness and farsightedness and how lenses can correct these by altering the path of light to focus correctly on the retina.

Describe how lenses can correct vision problems related to light focus.

What is the difference between nearsightedness and farsightedness in terms of light focus?