The majority of the chapter on light you need to know for the junior cert.
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Physics: Light
Light travels in straight lines. TO show this, set up an experiment like so.
Dispersion: the breaking up of white light into its spectrum colours. (spré)
If you place a pencil in a glass of water, it looks like if it is bent where it enters the water. This is because of REFRACTION.
Convex lens ; When the light falls on a convex lens it refracts and comes together at a point called the focal point.
