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Electromagnetic waves are transverse waves with a wide range of benefits and uses. Some of the waves also pose a risk and are hazardous to human tissues.

All objects are continually absorbing and emitting infrared radiation, which is essential for life on Earth.

Waves are one way in which energy may be transferred between stores. Both mechanical and electromagnetic waves will transfer energy but not matter.

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

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