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- 1How light travels Light travels as waves. These are transverse waves, like the ripples in a tank of water. The direction of vibration in the waves is at 90° to the direction that the light travels. Light travels in straight lines, so if you have to represent a ray of light in a drawing, always use a ruler. Unlike sound waves, light waves can travel through a vacuum (empty space). They do not need a substance to travel through, but they can travel through transparent and translucent substances. The table summaries some similarities and differences between light waves and sound waves.
- 2Reflection A ray diagram shows how light travels, including what happens when it reaches a surface. In a ray diagram, you draw each ray as: a straight line with an arrowhead pointing in the direction that the light travels Remember to use a ruler and a sharp pencil. The law of reflection When light reaches a mirror, it reflects off the surface of the mirror: The incident ray is the light going towards the mirror. The reflected ray is the light coming away from the mirror.
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- Citizenship Test physics Flashcards on Untitled, created by Archie Aldiss on 09/06/2017.
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- Archie Aldiss
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