1. 6.2 Extending Human Vision
Chapter 6
6.2 Extending Human Vision

2. Helping Us See
How do we see the tiniest micro-organisms that live around us?
We use microscopes
How do we see the stars and objects in space that are in the far-off distance?
We use telescopes

3. Microscopes Microscopes magnify objects (causes them to appear larger)
A microscope uses an objective lens (a convex lens) which allows for a magnified image.
The eyepiece is another convex lens that magnifies the image again.

4. Why don’t we see far away objects clearly?
As objects move away, less reflected light enters our eye.
The object appears dimmer as it moves away.
A telescope allows us to see distant objects clearly by gathering light.
The image produced by a telescope is much brighter and can be magnified!

5. Refracting Telescopes
A telescope also has an objective lens and an eyepiece lens
Objective lens: bends the light into focus and forms an image.
Eyepiece lens: magnifies the image and focuses the image.

6. Reflecting Telescopes
These telescopes use mirrors to direct and gather light
A concave mirror at the base of the telescope reflects and converges light
Light travels to a plane mirror, where it is reflected toward an eyepiece
A convex lens is used in the eyepiece: light rays converge together at a focal point to form an image

7. Reflected Light
Concave
Mirror
Plane Mirror
Convex Lens