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SingaporeCombined ScienceQuick questions
Physics: Waves, Electricity and Magnetism
Quick questions on Light and the electromagnetic spectrum: N(A)-Level Combined Science Physics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is reflection of light?Show answer
When light hits a smooth surface such as a mirror, it bounces off. We measure angles from the normal, a line drawn at to the surface at the point where the ray hits. The law of reflection states:
What is refraction of light?Show answer
When light passes from one material into another, such as from air into glass or water, it changes speed and usually changes direction. This bending is called refraction:
What is the electromagnetic spectrum?Show answer
Visible light is just one part of a much wider family of waves called the electromagnetic spectrum. They all travel at the same speed in a vacuum (the speed of light). In order of increasing frequency they are:
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