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13 Cards in this Set
- Front
- Back
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WHAT IS WHITE LIGHT?
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ORDINARY WHITE LIGHT, LIKE SUNLIGHT, IS
A MIXTURE OF ALL THE COLORS OF RAINBOW |
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WHY DOES A RED FLOWER LOOK RED
IN SUNLIGHT? |
THE ONLY LIGHT REACHING OUR EYE FROM
THE RED FLOWER IS RED LIGHT BECAUSE THE REST OF THE COLORS MIXED TOGETHER IN SUNLIGHT HAVE BEEN ABSORBED, OR "SWALLOWED UP" BY RED PART OF FLOWER. ONLY RED LIGHT IN THE SPECTRUM IS REFLECTED FROM IT. |
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WHAT COLOR WOULD DAFFODIL AND GRASS
REFLECT? |
DAFFODIL ABSORBS ALL THE COLORS IN
WHITE LIGHT EXCEPT YELLOW. GRASS ABSORBS ALL COLORS EXCEPT GREEN. |
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HOW DO WHITE AND BLACK OBJECTS
REFLECT SUNLIGHT? |
WHITE OBJECTS DO NOT REFLECT ANY OF
THE COLORS IN THE SPECTRUM. WHITE LIGHT IS REFLECTED TOTALLY. BLACK THINGS ARE OPPOSITE BECAUSE BLACK ABSORBS ALL THE COLORS IN THE SPECTRUM, SO THAT NONE OF THEM REACH OUR EYES. |
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HOW DOES A WHITE PAPER LOOK UNDER
YELLOW LIGHT OR OTHER ELECTRICAL LIGHT? |
WHITE PAPER REFLECTS EVERY COLOR AND
LOOKS WHITE IN SUNLIGHT. HOWEVER IN YELLOW LIGHT, ONLY A YELLOW LIGHT IS REACHING THE WHITE PAPER, SO ONLY A YELLOW LIGHT IS REFLECTED FROM IT. WHITE PAPER LOOKS YELLOW UNDER A YELLOW LIGHT. |
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WHAT COLOR WOULD A BLUE JUMPER LOOK
IN SUNLIGHT OR WHITE LIGHT? |
BECAUSE THE JUMPER IS BLUE, IT ABSORBS
EVERY COLOR OF THE SPECTRUM EXCEPT BLUE LIGHT. WHEN YOU SEE THE BLUE JUMPER IN WHITE LIGHT, IT LOOKS BLUE. |
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WHAT COLOR WOULD A BLUE JUMPER LOOK
IN DIFFERENT COLOR LIGHT? |
IF YOU LOOK AT A BLUE JUMPER IN RED
LIGHT, THE BLUE WILL NOT REFLECT ANY OF THE RED LIGHT - ALL THE LIGHT FALLING ON THE JUMPER WILL BE ABSORBED, AND THE JUMPER WILL LOOK BLACK. THE SAME WAY, RED JUMPER WILL LOOK BLACK IN BLUE LIGHT. WE CAN ONLY SEE THINGS IN THEIR "TRUE COLORS" IN WHITE LIGHT. |
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HOW CAN ALL SEVEN DIFFERENT SPLIT COLORS
BE PUT TOGETHER AGAIN? |
WHEN A WHEEL WITH 7 DIFFERENT COLORS
ON IT SPINS QUICKLY ENOUGH, IT APPEARS TO BE WHITE. OUR EYE PUTS THE COLORS BACK TOGETHER AGAIN. THAT SPINNING WHEEL IS CALLED NEWTON'S DISC. |
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WHAT ARE PRIMARY COLORS NEEDED TO MAKE
US SEE WHITE LIGHT? |
ONLY 3 COLORS ARE NEEDED TO MAKE US
SEE WHITE LIGHT: RED, GREEN AND BLUE. IF RED, GREEN AND BLUE LIGHTS ARE SHONE ONTO A WHITE SCREEN, THE LIGHTS MIX TOGETHER TO PRODUCE WHITE LIGHT WHERE ALL 3 LIGHTS MEET. |
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WHAT COLORS ARE PRODUCED WHEN TWO
OF THE THREE PRIMARY COLORS ARE MIXED? |
WHEN RED LIGHT IS MIXED WITH BLUE, IT
PRODUCES MAGENTA (PINK). WHEN BLUE IS MIXED WITH GREEN, IT PRODUCES CYAN (GREENISH-BLUE OR TURQUOISE). WHEN RED IS MIXED WITH GREEN, IT PRODUCES YELLOW. NOTE: WE ONLY GET THIS RESULT WITH COLORED LIGHTS, NOT PAINTS. |
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HOW IS THE COLOR TELEVISION PICTURE
MADE UP? |
THE 3 PRIMARY COLORS CAN BE USED
TO MAKE ALMOST ANY COLOR, WHEN THEY ARE MIXED TOGETHER IN THE RIGHT AMOUNTS. THE SCREEN OF COLOR TV IS COVERED WITH THOUSANDS OF SMALL RED, GREEN AND BLUE STRIPS. OUR EYES COLLECT THE LIGHT FROM THESE GLOWING STRIPS AND MIX THEM. |
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WHICH ARTIST USED USED THE TECHNIQUE
OF PAINTING WITH ONLY 3 PRIMARY COLORS? |
GEORGE SEURAT, A 19TH-CENTURY ARTIST,
DID ALL HIS PAINTINGS USING ONLY RED, GREEN AND BLUE DOTS. THE EYES OF THE PERSON LOOKING AT THE PAINTING DID THE MIXING FOR HIM. |
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WHAT DO SCIENTISTS KNOW ABOUT LIGHT?
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NEWTON BELIEVED THAT LIGHT WAS A FAST-MOVING STREAM OF LITTLE PARTICLES. IN 19TH CENTURY SCIENTISTS SAID NEWTON WAS WRONG AND THAT LIGHT WAS A WAVE. IN THE 20TH CENTURY, ALBERT EINSTEIN CLAIMED THAT NEWTON WAS RIGHT. TODAYSCIENTISTS BELIEVE THAT SOMETIMES LIGHTACTS AS A WAVE AND SOMETIMES A PARTICLE
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