2569742
Description
Flashcards by Karen Bugeja, updated more than 1 year ago
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Created by Karen Bugeja
over 9 years ago
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| Question | Answer |
| Luminous objects | Give off light e.g. the sun |
| Non-luminous objects | Do not give off light but reflect it from luminous objects |
| - What is light? - Conservation of Energy | Energy cannot be created or destroyed only converted. Light is a type of energy |
| How does light travel? | Straight lines |
| How fast is light compared to sound? Examples: | Light is much faster than sound e.g. thunderstorms and fireworks: the light is seen before it is heard. |
| Reflection | |
| Shadows | |
| Transparent | When light encounters a transparent material almost all of the light rays pass through |
| Translucent | When light encounters a translucent material some of the light rays pass through |
| Opaque | When light encounters an opaque material no light passes through. A shadow forms |
| Refraction | light does not have the same velocity in different mediums so the light rays become bent |
| Total internal reflection | |
| The eye | |
| Dispersion | |
| Function of the cornea | Refracts light as it enters the eye (by a fixed amount). |
| Function of Iris | Controls how much light enters the pupil. |
| Function of Pupil | Allows light to pass through as it enters the eye. |
| Function of lens | Refracts light to focus it onto the retina. |
| Function of Retina | Contains the light receptors, which trigger electrical impulses to be sent to the brain when light is detected. |
| Function of optic nerve | Carries impulses from the retina to the brain |
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