Light travels in straight lines until interacting with objects. It can scatter, reflect, refract, or be absorbed. Reflection causes light to bounce off a surface at the same angle. Refraction causes light to change speed and direction when passing from one medium to another, such as from water to air. Absorption occurs when light is taken in by an object and its energy is transferred to heat.

1. LIGHT HOW IT WORKS LIGHT how it works

2. CSS 6c HOW LIGHT MOVES Straight Line unless altered by what moving in.

3. LIGHT SCATTERS AS GOES Light scatters and looses energy the further away from its source.

4. SCATTERING Light released and spreads in all directions. Why room is even with light. Sky blue: shortest wavelengths, spread more.

6. REFLECTION Light bounces off surface at same angle it hits.

8. ABSORPTION LIGHT IS TAKEN IN BY AN OBJECT (MATTER) AND HOLDS IT. ENERGY TRANSFERRED FROM LIGHT TO HEAT. AIR PARTICLES DIMINISH LIGHT.

9. SCIENCE LIGHTS UP MY LIFE

10. TRAVELS THRU MATTER

11. CSS6f INTERACTS WITH MATTER TRANSMISSION Light goes straight unless changes what it travels through. Travels through matter: gases (air), liquids (water) and solid (glass).

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

13. CLEAR=TRANSPARENT SMOKY=TRANSLUCENT SOLID=OPAQUE

14. When Light Strikes an Object When light strikes an object, the light can be reflected, transmitted, or absorbed.

15. REFRACTION The change in direction and speed. Moving from water to air, light changes angles and speed of travel.

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

17. CSS 6d LENSES Alter direction of light. Concave-spreads out. Convex- brings to focal point.

18. 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.

19. Vision: response to the stimulus of light.

21. CSS6b Scattered light enters the Eye

22. ONCE ENTERS LIGHT SEEN

23. The eye works like a camera. reorder slides

24. REVIEW Light with Matter TRANSMISSION - light going through REFRACTION -light bending. ABSORBTION - light absorbed. REFLECTION - light bouncing off.

25. LIGHT - WHAT WE SEE LIGHT - energy by wavelengths at a level we can see. EM Spectrum - variety of wavelengths and frequency. Light is small band within.

27. Terms to help understand: WAVELENGTH Anything that causes a disturbance and transmits energy through matter. (ie: ripple on pond) FREQUENCY Number of waves in set time. Decides energy level.

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

29. What Is the Electromagnetic Spectrum? The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency.

31. CSS 6A VISIBLE LIGHT (part of EM spectrum)

32. Light travels thru water (why we see blue best)

33. TO SEE COLOR Different colors represent different wavelengths. Blue- smaller wavelengths Red- larger wavelengths Color Order: ROY G BIV red, orange, yellow, green, blue, indigo, violet

34. CSS 6e WHITE LIGHT Adding color makes WHITE Deleting color makes BLACK

35. MANY COLORS = WHITE

36. WHITE LIGHT Mixture of many color/wavelengths All colors reflected. Enters the eye’s retina 3 cones:red, blue & green Rods-shades

37. Electromagnetic Waves Believe it or not, you are being “showered” all the time, not by rain but by waves.

38. COLOR -decided by what absorbed. If object absorbs then hides color. All color absorbed = black If object reflects color then see. All color reflected = white