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Light
Revision Of Light chapter
Question | Answer |
---|---|
What is the main source of light and heat energy on the earth? | The Sun |
Light travels in straight lines but what are these lines called? | Rays |
What are luminous bodies? | Bodies that give off their own light. |
Give an example of a luminous body. | Sun, Light bulb, candle |
What are non-luminous bodies? | Bodies that do not give off their own light. They reflect light. |
What do you call the bouncing of light rays off a surface? | Reflection |
What is refraction? | The bending of light as it travels from one medium to another. |
Give a use of refraction. | Lenses in glasses or telescope |
What is the splitting of white light into its seven colours called? | Dispersion |
What are the seven colours of white light? | Red, Orange, Yellow, Green, Blue, Indigo, Violet |
Which colour is always at the outside of a rainbow? | Red |
Which colour is always at the inside of a rainbow? | Violet |
What is responsible for dispersing the sunlight in a rainbow? | Water droplets in the air (rain) |
What do you use in the lab to disperse white light into its seven colours? | Prism |
What is the more common name for the seven colours of white light? | The spectrum |
Which type of lens causes parallel light rays to focus on the one point? | Convex (Converging) Lens |
Which type of lens causes parallel light rays to spread out? | Concave (Diverging) Lens |
What is the dark area behind an object, caused by light rays being blocked out, more commonly known as? | A Shadow |