- #1
RockenNS42
- 52
- 0
We learning about light refraction in class the other day and I was just wondering what man made objects used it for and what man made light refraction is used for.
A man on The Science Channel said something interesting. Noting that the ability of a lens to focus relies on the light changing speed when it crosses the boundary between two substances, and noting that the eye needs a lens, the man on TV pointed out -- and this is a close paraphrase: "If light traveled at the same speed in all materials, everyone would be blind."