3584234
Description
Flashcards by mollycshamilton, updated more than 1 year ago
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Created by mollycshamilton
about 9 years ago
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| Question | Answer |
| CONVERGING LENS | Makes rays converge |
| DIVERGING LENS | Makes rays spread out |
| REFRACTION-AIR TO GLASS | TOWARDS NORMAL |
| REFRACTION-GLASS TO AIR | AWAY FROM NORMAL |
| REFRACTION | CHANGING DIRECTION OF WAVES WHEN THEY TRAVEL ACROSS A BOUNDARY FROM ONE MEDIUM TO ANOTHER |
| REFRACTIVE INDEX | sini ÷ sinr |
| i = 10 r = 6.5 n = ? | n = 1.54 |
| i = 20 r = 13 n = ? | n = 1.52 |
| REFRACTIVE INDEX | 1 ÷ sinc c = critical angle |
| Magnification | Hi ÷ Ho |
| 1 ÷ (d from o to l) + 1 ÷ (d from l to i) | = 1 ÷ focal length |
| Iris | Controls amount of light entering the eye BRIGHT LIGHT-EXPANDS (LETS IN SMALL AMOUNT) DIM LIGHT-CONTRACTS (LETS IN LARGE AMOUNT) |
| Lens | Focuses light onto retina |
| retina | Light sensitive cells around the inside of the eye |
| Optic nerve | Transfers signals from retina to brain |
| Eye muscles | Move eye |
| Ciliary muscles | fine focusing. CONTRACT AND SQUEEZE LENS SO ITS FATTER TO FOCUS ON CLOSE UP THINGS. RELAX LENS TO SEE THINGS FAR AWAY |
| Pupil | where light enters eye |
| Cornea | Focuses the view on Retina |
| Myopia-Short sighted Eye lens too strong Fix with diverging lens | |
| Long sighted Eye lens too weak Fix with converging lens | |
| 1 ÷ Focal length in metres | = power of lens |
| TOTAL INTERNAL REFLECTION | OCCURS WHEN THE ANGLE OF INCIDENCE OF A LIGHT RAY IN A TRANSPARENT MEDIUM IS GREATER THAN THE CRITICAL ANGLE. |
| AN EXAMPLE OF SOMETHING THAT USES TOTAL INTERNAL REFLECTION | ENDOSCOPE |
| HOW ENDOSCOPE WORKS | TWO BUNDLES OF OPTIC FIBRES. INSERTED IN THROAT ONE SHINES LIGHT ONE CARRIES LIGHT BACK TO THE OBSERVER. LENS FORMS AN IMAGE ON THE END OF FIBRES. PROCESS-TOTAL INTERNAL REFLECTION |
| THE IMAGE PRODUCED BY A DIVERGING LENS IS | VIRTUAL |
| WHEN THE OBJECT IS NEARER TO THE LENS THAN THE PRINCIPAL FOCUS WITH A CONVERGING LENS THE IMAGE PRODUCED IS | VIRTUAL |
| POSITION AND NATURE OF IMAGE FORMED BY A LEN DEPENDS ON | FOCAL LENGTH DISTANCE FROM OBJECT TO LENS |
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