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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.

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Presentation Transcript
a note on dispersion
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
Color for Humans

Rods (light/no light)

Cones (sensitive to different frequencies)

plane mirror
Plane Mirror
  • Plane = flat
spherical mirrors
Spherical Mirrors
  • Part of Spheres
  • Concave (“cave”)
  • Convex
image distortion
Image Distortion
  • Made larger or smaller = magnified
  • Right side up or upside down = upright or inverted
focal point for lenses1
Focal Point for Lenses
  • http://www.katu.com/news/local/Snow-globe-responsible-for-unusual-fire-143567556.html?tab=video&c=y
today
Today:
  • What do you see looking in the convex mirror?
  • What do you see looking in the concave mirror?
today1
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?
today2
Today…
  • Choose One of the reflection problems and work it. Remember, 180 degrees in a straight line, and 90 degrees in a right angle.
today3
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: