1. Unit Two: Microscope and Light

2. Microscope What is Magnification?
When objects are made to appear larger than they really are-
A larger than life image

3. What tools can you use to magnify something?

4. Microscope Who is Anton Van Leewenhoek?
One of the first to discover microscopic organisms
He was one of the first to use a microscope to view living cells and small organisms

5. Anton Van Leewenhoek What are animacules?
Organisms he saw in the pond water

6. Robert Hooke First to look at Cells under the microscope.
He used microscope to look at everyday things (cork, leaves, fleas!)

7. What is a lens? Curved piece of glass that bends (refracts) light
Convex
Concave

8. Types of Microscopes Electron
Uses electrons (tiny particles) to magnify an object
Can magnify 100,000 times
Particles bounce off the image
Types of Microscopes
Simple
Uses 1 lens
Uses light
Example: Magnifying glass
Compound
Uses at least 2 lenses
Uses light
Can magnify 1,000 times

9. Types of Microscopes

10. of the compound microscope
Identify the parts
of the compound microscope

11. of the compound microscope
Identify the parts
of the compound microscope
Eyepiece
Nosepiece
Body Tube
Arm
Objective Lenses
Diaphragm
Stage
Coarse focusing
Light
Fine Focusing knob
Base

12. Calculating Magnification
How many times bigger are you making the object?
To calculate, Multiply the Eyepiece X the Objective Lens
Ocular
objective

13. Calculating Magnification
TM =
Ocular Magnification X Objective Magnification
Ocular
objective

14. Prism Refracts white light into all of its colors.
WHITE light is a combination of ALL colors of light

15. Light can be Transmitted
Transparent
Objects are seen clear
Transparency has NO color

16. Light can be Transmitted
Translucent
Light transmitted through a substance that scatters the light
The image looks fuzzy and lacks detail
Examples: wax paper, etc.

17. Light can be transmitted
Opaque
A substance that does not transmit light.
Doesn’t allow light to pass through it
Examples: your hand, a piece of paper, etc.

18. Light can be absorbed Absorbed
All of the light is collected in the object, no light appears out of the object.
A pencil is yellow because yellow light bounces off it while all other colors are absorbed.

19. Light can be reflected
Reflected - The bouncing back of light

20. Light can be Refracted
Refracted – the bending of light

21. What is a lens? Curved piece of glass that bends (refracts) light
Convex
Concave

22. Who wears what lens? Concave = Nearsighted (can not see far away)
Convex = Farsighted (cannot see near)

23. Uses of light instruments
Natural light – Sun, Fire, Lightening
Optical instruments – Cameras, Telescopes, Microscopes
Lasers – Intense beam of light of one color (medicine, industry, communication)
Fiber Optics – strands of glass that carry more information than copper wires

24. The Eye
Label the parts of the eye

25. The Eye

26. The Eye CORNEA - transparent, outer layer
IRIS - colored portion of eye
PUPIL – “hole” in the iris that opens/closes to allow more/less light
LENS – gets wider/thinner to focus
RETINA – membrane in back of eye contains rods &cones
OPTIC NERVE –sends image from retina to the brain