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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.
I wonder if somewhere in evolutioniary history some organisms have had eyes which work on the same principle as the pinhole camera.There is no refraction needed with these.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."