2 4ape a piece of cardboard over the hole 4hen use a

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2. 4APE A PIECE OF CARDBOARD OVER THE HOLE. 4HEN USE A PIN TO MAKE A SMALL HOLE IN THE CARDBOARD THROUGH THE NAIL HOLE. * (INT: &OR BEST RESULTS, MAKE THE PINHOLE AS SMALL AND AS ROUND AS POSSIBLE.+ 4. /OW YOU ARE READY TO USE YOUR PINHOLE CAMERA. 0OINT THE PINHOLE TOWARD A STRONG SOURCE OF LIGHT, LIKE A LIGHTBULB. 4HE PINHOLE CAMERA WILL WORK BEST IF THE PINHOLE IS ABOUT 3 FEET FROM THE LIGHTBULB. 9OU SHOULD SEE AN IMAGE OF THE LIGHTBULB PROJECTED ONTO THE WAXED PAPER. * " 3 3 - - * " 33 - - * " 33 - -
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#OPYRIGHT © BY (OLT, 2INEHART AND 7INSTON. 2 (OLT 'EOMETRY !LL RIGHTS RESERVED. /AME $ATE #LASS *À¦©iVÌ #LOSE %NCOUNTERS Ç #(!04%2 !VÌ¡Û¡ÌÞÊÓ\Ê1¤`iÀÃÌ>¤`¡¤}ÊÌ¥iÊ*¡¤¥¦§iÊ+>¨iÀ>Ê (OW DOES A PINHOLE CAMERA PRODUCE AN IMAGE? 7HY IS THE IMAGE SMALLER THAN THE ACTUAL OBJECT? 7HY IS THE IMAGE UPSIDE DOWN? 9OU CAN USE THE MATHEMATICS OF SIMILAR TRIANGLES TO ANSWER THESE QUESTIONS. 7ORK WITH A PARTNER FOR THIS ACTIVITY. 1. 5SE YOUR PINHOLE CAMERA TO VIEW A STRONG SOURCE OF LIGHT, SUCH AS A LIGHTBULB. 4HE IMAGE ON THE WAXED PAPER IS PRODUCED BY LIGHT TRAVELING THROUGH THE PINHOLE, AS SHOWN IN THE FIGURE. 2. !S YOU VIEW THE IMAGE, HAVE YOUR PARTNER USE A METERSTICK OR TAPE MEASURE TO MEASURE THE DISTANCE FROM THE PINHOLE TO THE LIGHTBULB. 2ECORD THIS DISTANCE IN THE SPACE PROVIDED IN THE FIGURE. !LSO, MEASURE THE LENGTH OF THE COFFEE CAN AND THE LENGTH OF THE LIGHTBULB, AND RECORD THESE IN THE FIGURE. 3. 5SE SIMILAR TRIANGLES TO CALCULATE THE LENGTH OF THE IMAGE OF THE LIGHTBULB ON THE WAXED PAPER. 2ECORD THE LENGTH BELOW. @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 4. )S THE LENGTH YOU CALCULATED CLOSE TO THE TRUE LENGTH OF THE IMAGE? &IND OUT BY VIEWING THE LIGHTBULB FROM THE SAME POSITION AS BEFORE AND MEASURING THE LENGTH OF THE IMAGE ON THE WAXED PAPER. $ISTANCE FROM PINHOLE TO LIGHTBULB 5 -ENGTH OF CAN 5 -ENGTH OF LIGHTBULB 5
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