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Revision Of Light chapter

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the 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  


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