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ciannas optics
optics test flashcards
| Question | Answer |
|---|---|
| what is the longest wavelength? | radio waves |
| what is the shortest wavelength? | gamma rays |
| primary colours? | red, blue, green |
| secondary colours? | red+green=yellow, green+blue=cyan, blue+red=magenta |
| complementary colours? | red+cyan, green+magenta, blue+yellow |
| difference between transparent, translucent and opaque? | transparent; allows wavelengths to pass through. translucent; allows some light to pass through. opaque; does not allow light to pass through |
| )( is ? and () is ? | )( is concave/diverging and () is convex/converging. |
| in a converging lens, where is F? where is F in a diverging lens? | F is on the opposite side of the object in a converging lens, and F is on the same side of the object in a diverging lens. |
| what is 0.000 012 3 in scientific notation? | 1.23 x 10^ -5 |
| what is the formula for index of refraction? | n=c/v |
| in reflection, and of incidence =? | angle of incidence = angle of refraction |
| if angle of incidence is 0, what is the angle of refraction? | 0 |
| why can we still see the sun when its setting? | its rays refract through the atmosphere and bend towards the surface on the Earth. |
| why does a diamond sparkle? | light entering a diamond will experience TIR multiple times before it exists the diamond |
| how can you determine the critical angle? | set angle of refraction (theta r) to 90 degrees |
| if an image is formed on the opposite side of the object, what type of image is it? | real image |
| if an image is formed on the same side as the object, what type of image is it? | virtual image |
| for thin lens equations, when is f positive and when is it negative? | f is positive for a converging lens, and f is negative for a diverging lens |
| what cells allow us to see at night? | rod cells |
| what happens to black and white objects? | black; absorbs all colours. white; reflects all colours |
| what rays can penetrate through human tissues? | gamma rays |
| what causes a rainbow to form? | dispersion within droplets of water |
Created by:
ciannawilliams
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