VISUAL VOCABULARY: LIGHT GRADE 7 SCIENCE

LIGHT CAN BE SEEN AS: RAYS WAVES

WAVE DISTURBANCE IN SPACE-TIME MOVES ENERGY WITHOUT MOVING MATTER

MEDIUM WHAT THE WAVE IS TRAVELING THROUGH SOLID LIQUID GAS

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

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

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

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

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

TRANSMISSION LIGHT PASSING THROUGH AN OBJECT TRANSPARENT TRANSMITS BEST

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

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

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

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

LAW OF REFLECTION

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

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

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

IN FOCUS OUT OF FOCUS

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

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

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

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