1) Explain why refraction happens. 2) What are the 3 primary colours of light? 3) What are the 3 secondary colours of light? How are they made? 4) Which colours of light are absorbed by a red object? 5) Which colour of light is reflected by a red object? 6) What is focal length? 7) What is the principal focus? 8) What type of image does a magnifying glass form? 9) What is specular reflection? 10) What is diffuse reflection? 11) What is refraction? 12) What is the law of reflection? 13) How will a ray refract if at a boundary it slows down? 14) How will a ray refract if at a boundary it speeds up? 15) What type of wave is an electromagnetic wave? 16) Which electromagnetic wave has the highest frequency? 17) State the speed of electromagnetic waves in a vacuum. 18) State the relationship between energy and frequency. 19) State 2 uses of microwaves 20) State the electromagnetic wave that is used for Bluetooth communication 21) State the hazards of UV waves 22) State 2 uses of gamma waves 23) Explain why x-rays are used to image bone 24) State which surfaces are the best emitter and best absorber of infrared radiation 25) State which surfaces are the worst absorber of infrared radiation. 26) State what is meant by ionising 27) State the waves of the EM spectrum in order from largest wavelength to shortest. 28) Describe how radio waves are received.

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