Retina, The light sensitive part of the eye, Lens, The part of the eye which refracts light, Refraction, The bending of light as it changes speed, Density, A measure of the particles in a space, Normal, The line drawn at 90O  to the material boundary, Incident ray, The ray coming from the ray box to the glass block, Refracted ray, The ray showing light has changed speed and so direction, Protractor, The equipment we use to measure angles, Slow down, When light does this it bends towards the normal, Speed up, When light does this it bends away from the normal.

Refraction

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