1. VISUAL VOCABULARY: LIGHT
GRADE 7 SCIENCE

2. LIGHT CAN BE SEEN AS:
RAYS
WAVES

3. WAVE
DISTURBANCE IN SPACE-TIME
MOVES ENERGY
WITHOUT MOVING MATTER

5. MEDIUM
WHAT THE WAVE IS TRAVELING THROUGH
SOLID
LIQUID
GAS

6. MECHANICAL WAVE WAVE THAT TRAVELS THROUGH A MEDIUM
PARTICLES DON’T MOVE – JUST COLLIDE AND PASS THE ENERGY ON (LIKE DOMINOS)

7. ELECTROMAGNETIC WAVE NO MEDIUM NEEDED!
CAUSED BY CHARGES IN ELECTRIC AND MAGNETIC FIELDS

9. VISIBLE LIGHT ONLY PART OF EM SPECTRUM THAT WE CAN SEE
LONGER WAVELENGTH
SHORTER WAVELENGTH
ONLY PART OF EM SPECTRUM THAT WE CAN SEE
DIFFERENT WAVELENGTHS ARE DIFFERENT COLORS

10. COLORS OF LIGHT PRIMARY COLORS: RED, GREEN, BLUE
DIFFERENT FROM MIXING PAINT AND PIGMENTS
PRIMARY COLORS: RED, GREEN, BLUE

11. OPAQUE, TRANSLUCENT, TRANSPARENT
PROPERTIES THAT AFFECT HOW LIGHT INTERACTS WITH AN OBJECT
TRANSLUCENT
OPAQUE
TRANSPARENT

12. TRANSMISSION LIGHT PASSING THROUGH AN OBJECT
TRANSPARENT TRANSMITS BEST

13. ABSORPTION LIGHT IS TAKEN UP BY MATTER
OBJECTS ABSORB ALL THE COLORS EXCEPT FOR THE COLOR OF THE OBJECT

14. SCATTERING OBJECTS REFLECT LIGHT IN ALL DIRECTIONS
(AKA DIFFUSE REFLECTION)
OBJECTS REFLECT LIGHT IN ALL DIRECTIONS
IF LIGHT DIDN’T SCATTER, THEN EVERYTHING WOULD ACT LIKE A MIRROR

15. REFLECTION LIGHT REFLECTS/BOUNCES BACK FROM AN OBJECT
OBJECTS REFLECT THE COLOR LIGHT THAT THEY ARE

16. REFLECTION VS. SCATTERING
EX: RED SHIRT – (IRREGULAR SURFACE)
EX: MIRROR
(REGULAR SURFACE)

17. LAW OF REFLECTION

18. MIRROR
OBJECT THAT REFLECTS LIGHT SO WELL THAT OBJECTS LOOK THE SAME

19. REFRACTION
THE BENDING OF A WAVE WHEN IT ENTERS A MEDIUM WHERE ITS SPEED IS DIFFERENT.

20. LENS DIFFERENT SHAPES TO MAGNIFY OR FOCUS
DEVICE THAT TRANSMITS AND REFRACTS LIGHT

21. IN FOCUS
OUT OF FOCUS

22. TYPES OF LENSES CONVEX LENS LIGHT RAYS CONVERGE CONCAVE LENS
LIGHT RAYS DIVERGE

23. HUMAN EYE
THE LENS DIRECTS AND FOCUSES LIGHT COMING INTO THE EYE

24. NEARSIGHTEDNESS FIX WITH A CONCAVE LENS *EYE TOO LONG
*IMAGE FOCUSED BEFORE RETINA
FIX WITH A CONCAVE LENS

25. FARSIGHTEDNESS FIX WITH A CONVEX LENS EYE TOO SHORT
IMAGE FOCUSED BEHIND RETINA
FIX WITH A CONVEX LENS