Notes 2-5

1
Notes 2-5

• OPTICAL TOOLS

2
Cameras

• How do they work?

• Light from object travels through one or more
  convex lenses
• Lens focuses light
• Puts an image on film in back of camera

3
Cameras

• What type of image is produced?

• Real image that is upside down

4
Cameras

• Special notes

• Has a device called a diaphragm with a hole
  called an aperture.
• Aperture is made smaller or larger to control
  amount of light
• Similar to how iris controls the size of pupil in
  your eye
• Digital cameras have a light sensitive screen
  inside camera for image to form on

5
Telescopes

• How do they work?

• Use a combination of lenses or mirrors to collect
  and focus light from distant objects

6
Telescopes

• What type of image is produced?

• Real image that is upside down

7
Telescopes

• Special notes

• Refracting telescopes use 2 convex lenses, an
  objective, and an eyepiece
• Reflecting telescopes use a large concave mirror,
  then a small plane mirror, then a convex lens in
  the eyepiece

8
Microscopes

• How do they work?

• Light passes through object, then through
  objective lens (convex lens that magnifies), then
  through eyepiece (convex lens that magnifies even
  more)

9
Microscopes

• What type of image is produced?

• Real image that is upside down and backwards

10
Microscopes

• Special Notes

• Light microscopes- what we will be using in this
  class
• Electron microscopes- uses a beam of electrons to
  make a magnified image of very tiny objects VERY
  expensive