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Description
Flashcards by Denise Castillo, updated more than 1 year ago
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Created by Denise Castillo
almost 9 years ago
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| Question | Answer |
| where does light travel at a constant speed | in a vacuum |
| What is transmission | light goes through an object and no energy is lost |
| what is reflection | when light hits and bounces off an object |
| what is absorption | light hits an object and the object gains the energy |
| what is diffraction | when light bends around and object causing blurred edges on the image |
| what is a rainbow | refracted light in raindrops or mist |
| how is a rainbow formed | light enters a water droplet and refracts, reflects on the edge, and refracts on the way out again. |
| where must the sun be in order to see a rainbow | the sun must be BEHIND YOU!!! |
| What is a spectrum? | A band of colours, as seen in a rainbow, produced by separation of the components of light. |
| What is a mirage? | An illusion of water or inverted images due to non-uniform refraction with heat. |
| How are mirages made? | mirages are made when the road is hotter or colder than the air above it. The light will take the easiest path (Warm air) bending during the process. as the light bends, with distance, we see an inverted or floating image. |
| As we move from red to violet light, the wavelengths get _________ a) longer b)Shorter | B) the wavelengths get shorter |
| What is the doppler effect? | The doppler effect is when light is modified because the light source is moving squeezing the waves at the front but spreading out the one at the back. |
| All the stars are slightly red (redshift) so using the doppler effect it means that the stars are moving away and the universe is expanding. this means that__________ | there must have been a time when the universe was zero, the universe may have started with a big explosion called "The big bang". |
| What is the big bang | A THEORY!!! |
| What gives off light? | Things that burn |
| why is the sky blue | light goes through atmosphere and long wavelengths pass straight through (Reds, yellows). shorter wavelengths are absorbed by gas and radiated around the sky. |
| why are sunsets red? | the light has to pass through more atmosphere because of the angle of the earth. Light must travel further so the reds (Long wavelengths) get radiated and blues get far too radiated to see. |
| What is a focal point? | a focal point is where refracted rays of light meet. |
| where must the focal point be in the eye in order to see well. | It must be in the retina. (Back of the eye) |
| what do glasses do? | they change the focal point to the retina. |
| if the focal point is in front of the retina, what lens do we use to fix this. a) Converging b) Diverging | b) Diverging |
| if the focal point is past of the retina, what lens do we use to fix this. a) Converging b) Diverging | a) Converging |
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