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All waves will reflect and refract in the right circumstances. The reflection and refraction of light explains how people see images, colour and even optical illusions.

Lenses are precisely shaped pieces of glass that have been developed and used in corrective glasses, telescopes, microscopes, binoculars, and magnifying glasses.

Electromagnetic waves are transverse waves with a wide range of properties and uses. All objects are continually absorbing and emitting infrared radiation, affecting their temperatures.

Understanding how to approach exam questions helps to boost exam performance. Questions will include multiple choice, structured, using mathematical skills and extended writing.