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,

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