Flashcards
Light
Cards in this deck (20)
- 1Luminous objectsGive off light e.g. the sun
- 2Non-luminous objectsDo not give off light but reflect it from luminous objects
- 3- What is light? - Conservation of EnergyEnergy cannot be created or destroyed only converted.
Light is a type of energy - 4How does light travel?Straight lines
- 5How 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.
- 6Reflection
- 7Shadows
- 8TransparentWhen light encounters a transparent material almost all of the light rays pass through
- 9TranslucentWhen light encounters a translucent material some of the light rays pass through
- 10OpaqueWhen light encounters an opaque material no light passes through. A shadow forms
- 11Refractionlight does not have the same velocity in different mediums so the light rays become bent
- 12Total internal reflection
- 13The eye
- 14Dispersion
- 15Function of the corneaRefracts light as it enters the eye (by a fixed amount).
- 16Function of IrisControls how much light enters the pupil.
- 17Function of PupilAllows light to pass through as it enters the eye.
- 18Function of lensRefracts light to focus it onto the retina.
- 19Function of RetinaContains the light receptors, which trigger electrical impulses to be sent to the brain when light is detected.
- 20Function of optic nerveCarries impulses from the retina to the brain