1. LIGHT
how it works

2. Straight Line unless altered by it is what moving in.
HOW LIGHT MOVES:
Straight Line unless altered by it is what moving in.

3. When light strikes an object, the light can be reflected, absorbed, transmitted, or refracted.

5. Light bounces off a surface at same angle it hits.
REFLECTION
Light bounces off a surface at same angle it hits.

6. ABSORPTION
Light is taken in by an object, and the energy is transferred from light to heat.

7. Transmission
Travels through matter: gases (air), liquids (water) and solid (glass).

8. TRANSMISSION: Terms for mediums
Transparent- allows all light through.
Translucent- allows some light through.
Opaque- allows no light through.

9. CLEAR=TRANSPARENT
SMOKY=TRANSLUCENT
SOLID=OPAQUE

10. REFRACTION The change in direction and speed as a wave changes medium
Moving from air to water, light changes angles and speed of travel.

11. Refraction of Light
When light rays enter a medium at an angle, the change in speed causes the rays to bend, or change direction.

12. LENSES Alter direction of light. Concave-spreads out.
Convex- brings to focal point.

13. LENSES con’t CONVEX -brings image to focal point.
Image is larger and upside down.
ie: eye, microscope, magnifying glass.
CONCAVE
-spreads image out.
-image is smaller and upright.
ie: corrective glasses.

14. Lens of the Eye is convex

15. Corrective lenses
Far sighted (convex)
Near sighted (concave)

16. What is it?
Visible Light- only a small part of the electromagnetic spectrum

18. EM ENERGY: Long wavelengths + Low frequency = LOW ENERGY
Short wavelengths +
High frequency =
HIGH ENERGY

20. VISIBLE LIGHT (part of EM spectrum)

21. Different colors represent different wavelengths.
Red- larger wavelengths, lower frequencies
Purple- smaller wavelengths, higher frequencies,
Color Order: ROY G BIV
red, orange, yellow, green, blue, indigo, violet

22. WHITE LIGHT Mixture of all colors of light
No light reflected makes BLACK

23. MANY COLORS = WHITE

24. The color you see -decided by what is absorbed.
If an object absorbs a color then it’s not seen.
All color absorbed = black
If object reflects color then it’s seen.
All color reflected = white