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# prisms

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## kelli smith

on 9 March 2011

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#### Transcript of prisms

Effects of Light
•When light passes from the air into glass, it slows down, and when it leaves the glass, it speeds up again. If the light hits the glass at an angle instead of dead-on, it undergoes refraction. The angle at which it hits the glass is not the same as the angle it travels inside the glass. The light is no longer moving in a straight line, but gets bent at the surface. The same thing happens when the light leaves the prism--it bends again

Read more: How Do Prisms Work | eHow.com http://www.ehow.com/how-does_4965588_prisms-work.html#ixzz1G7OQSxxx
Snell's Law
•An optical principle called Snell's Law predicts exactly how this happens. Snell's Law deals with the angles that light enters and leaves a prism, and something called the index of refraction. The index of refraction shows how much light slows down when it goes into the glass

Read more: How Do Prisms Work | eHow.com http://www.ehow.com/how-does_4965588_prisms-work.html#ixzz1G7SJd4OQ
Color Changes
•The different colors of light, from red to violet, each get bent at slightly different angles. Red gets bent the least, violet the most. This causes the colors to fan out and become distinct.

Read more: How Do Prisms Work | eHow.com http://www.ehow.com/how-does_4965588_prisms-work.html#ixzz1G7SghWQv How do prisms work?
Reflection
•In addition to refracting light, prisms are also good for reflecting light. If you look into a prism and turn it in your fingers, you'll see light reflected off the back side at certain angles. This is called internal reflection. Some prisms are designed to have several internal reflecting faces. They can take a telescope image that is upside-down and backwards and flip it back to normal. Reflecting prisms are used in periscopes and binoculars, as they are more durable than mirrors.

Read more: How Do Prisms Work | eHow.com http://www.ehow.com/how-does_4965588_prisms-work.html#ixzz1G7X58tTY A narrow shaft of white light enters a prism from the lower left. A specular reflection bounces off the first surface while the remaining light refracts and is dispersed by the first and second surface, resulting in a spectrum. FIN
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