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Physics Y7
Light
| Term | Definition |
|---|---|
| What does luminous mean? | an object that produces light |
| How do we see a non luminous light | We only see a non luminous light when light bounces of it |
| What are light rays? | an imaginary line that represents a beam of light |
| Why do we hear thunder after we see lightning? | Light travels faster than sound |
| What does transparent mean? | Clear or completely see-through. |
| What does translucent mean? | allows some light to pass through |
| What does opaque mean? | Does not allow light to pass. |
| What is a vacuum? | an empty space with no particles and no pressure |
| Why can light travel through space? | It does not need particles |
| What is the speed of light? | 300,000,000 m/s |
| What is a light year? | How far light travels in a year (distance) |
| When you look in a mirror, what type of image do you see? | A virtual image |
| What happens to light when it hits a mirror? | it reflects |
| What is the incident ray? | a ray of light that strikes a surface |
| What is the reflected ray? | the ray of light that reflects off a surface |
| The angle of incidence is equal to...? | angle of reflection |
| What is refraction? | the bending of waves due to a change in speed |
| When a wave goes from air to water what happens to the speed? | It slows down |
| When a wave goes from air to water, what happens to the angle of the light ray? | Light bends towards the normal |
| What does a lens do? | focuses light |
| What is a convex lens? | A lens that is thicker in the middle than at the edges |
| What does the lens do in the eye? | Focuses light on the retina |
| What is the optic nerve? | Nerve that connects the eye to the brain |
| What is the iris? | Coloured part of the eye that has muscles to control the pupil size |
| What is the cornea? | The transparent layer at the front of the eye |
| How does a pinhole camera work? | light enters camera through pinhole and forms a real image on a screen |
| What is a real image? | An image formed by focusing light rays onto a screen. |
| Light with a higher frequency is refracted MORE/LESS than light with a lower frequency? | MORE |
| What are the 3 primary colours of light? | red, green, blue |
| How do you make the secondary colours of light? | By mixing two of the primary colours of light |
| If you mix all 3 primary colours of light, what colour do you produce? | White |
| What happens to light if you put a red filter on? | transmits red wavelengths and absorbs all others |
| What is a retina | light-sensitive inner surface of the eye, containing rods and cones |
| What are the secondary colours of light | cyan, magenta, yellow |
Created by:
Hermoine14Granger
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