Color, Intro to Mirrors and Lenses

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# Color, Intro to Mirrors and Lenses - PowerPoint PPT Presentation

Color, Intro to Mirrors and Lenses. A note on Dispersion…. White light is light composed of light of many wavelengths, forming a spectrum When white light is sent through a prism, the light refracts Different frequencies are slowed more than others, thus they bend more than others.

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### Color, Intro to Mirrors and Lenses

A note on Dispersion…
• White light is light composed of light of many wavelengths, forming a spectrum
• When white light is sent through a prism, the light refracts
• Different frequencies are slowed more than others, thus they bend more than others.
Color for Humans

Rods (light/no light)

Cones (sensitive to different frequencies)

Plane Mirror
• Plane = flat
Spherical Mirrors
• Part of Spheres
• Concave (“cave”)
• Convex
Image Distortion
• Made larger or smaller = magnified
• Right side up or upside down = upright or inverted
Focal Point for Lenses
• http://www.katu.com/news/local/Snow-globe-responsible-for-unusual-fire-143567556.html?tab=video&c=y
Today:
• What do you see looking in the convex mirror?
• What do you see looking in the concave mirror?
Today…
• Find the focal length of your convex lens:____
• Look through each of your concave lenses at a distant object, and at a close object. Write what you see in terms of image size, and upright or inverted?
Today…
• Choose One of the reflection problems and work it. Remember, 180 degrees in a straight line, and 90 degrees in a right angle.
Today…

On the worksheet provided, use the law of reflection, θi = θr to show how the light bounces off a concave, and off a convex mirror. Your picture should look somewhat like this: