Flashcards
P3
Flashcards do conjunto (24)
- 1GIVE THE EQUATION FOR LIGHT INTENSITYINTENSITY =
POWER OF INCIDENT RADIATION
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AREA - 2WHAT IS AN ENDOSCOPEOPTICAL FIBRE DIRECT LIGHT ALONG A TUBE INTO THE BODY.
THERE IS A CAMERA AT THE END OF THE TUBE - 3WHAT IS ULTRASOUNDWHEN HIGH FREQUENCY WAVES ARE USED TO PRODUCE AN IMAGE
- 4WHAT IS A CAT SCAN ?USING IONISING XRAYS A COMPUTER COMBINES THOUSANDS OF IMAGES TO PRODUCE DETAILED SLICES THROUGH THE BODY
- 5WHAT IS A PET SCAN ?WHEN A RADIOACTIVE SOURCE IS INJECTED INTO THE BODY A SCANNER DETERS THE RADIATION AND HELPS SHOW HOW PARTS OF THE BODY ARE WORKING
- 6WHAT IS RADIATION?ENERGY CARRED BY WAVES OF PARTICLES CARRIED BY A SOURCE
- 7WHAT DOES INTENSITY OF RADIATION DO WITH INCREASING DISTANCE FROM THE SOUCRE ?DECREASES
- 8—
- 9WHAT IS THE AVERAGE NEAR POINT OF THE HUMAN EYE25CM
- 10WHAT IS THE AVERAGE FAR POINT OF THE HUMAN EYE?INFINITY
- 11LIST TWO TREATMENTS FOR BAD EYES-CONTACT LENSES :- PLACED ON THE EYE
-LASER CORRECTION:- LAZER BEAM USED TO RESHAPE THE FRONT OF THE CORNEA THE LAZER THEN CUTS THE TISSUE AND ALTERS THE SHAPE OF IT - 12HOW IS SHORT SIGHTEDNESS CAUSED?EYEBALL TO LONG OR CORNEA BEING CURVED TO SHARPLY
THIS MEANS RAYS OF LIGHT ARE FOCUSED INFRONT OF THE RETINA - 13HOW IS LONG SIGHTEDNESS CAUSED?WHEN THE EYEBALL IS TO SHORT OR THE LENS NOT THICK ENOUGH :- IT CANNOT BEND LIGHT ENOUGH MEANING THE LIGHT IS FOCUSED AT THE BACK OF THE EYE
- 14WHAT IS THE FOCAL DISTANCETHE DISTANCE FROM THE LENS TO THE FOCAL POINT
- 15WHAT DOES A CONVERGING LENS DOWHEN PARALLEL RAYS OF LIGHT ARE REFRACTED AND MEET AT THE FOCAL POINT
- 16WHAT DOES A DIVERGING LENS DO ?THE POINT IN WHICH THE RAYS SEEM TO BE COMING AFTER PASING THROUGH THE LENS
- 17A MORE POWERFUL LENS WILL HAVE A MORE SHARPLY CURVED FACE WHICH CAUSES THE RAS TO DIVERGE MORE SO THE FOCAL LENGTH IS SHORTENDPOWER OF LENS =
1
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FOCAL LENGTH - 18WHAT IS THE MEASURMENT FOR THE POWER OF THE LENSDIOPTRES
- 19WHAT DOES F,U AND V STAND FOR IN THE EQUATION ? 1/F= 1/U + 1/VF = FOCAL LENGHT
U = OBJECT DISTANCE
V= IMAGE DISTANCE - 20—
- 21ADD SNELLS LAWYIPEEEEE
- 22WHAT DO OPTICAL FIBRES IN ENDOSCOPES DO?-ALLOWS SURGEON TO EXAMINE THE INSIDE OF A PATIENT
-LIGHT IS REFELCTED OFF THE INSIDE OF THE BODY AND IS THEN GATHERED AND FOCUSED BY AN EYEPIECE LENS
-THIS FORMS A CLEAR IMAGE OF THE INSIDE OF THE BODY - 23LIST SOME ULTRASOUND USESCAN HELP LOCATE KIDNEY STONES
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THE STONES ABSORB THE ULTRASOUND ENERGY AND THIS BREAKS THE STONES U - 24HOW DOES AN ULTRASOUND WORK?WAVES TRAVEL THORUGH THE BODY AND ARE REFLECTED AT THE INTERFACE BETWEEN TISSUES. THIESE A REFLECTED THEN DETECTED AND CONVERTED ONTO AN IMAGE ON SCREEN .
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- FlashCards sobre P3, criado por mathilde_ndoye em 27-05-2015.
- Criado por
- mathilde_ndoye
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