Law of reflection , angle of incidence is always equal to the angle of reflection, Reflection, Light bounces off a boundary , Features of a mirror image , virtual, same size as object, laterally inverted, same distance behind mirror as object is infront, Focal length , Distance from the optical centre to the principle focus, Principle Focus , Point where rays of light pass after refraction in a convex lens , critical angle , The angle of incidence in the medium resulting in an angle of refraction of 90 degrees in air , Total Internal Reflection, Light travels from a dense material towards the boundary of a less dense material and the angle of incidence is greater than the critical angle, Dispersion , The splitting of white light into its component colours , Refraction , Change in direction of light as it changes from one material to another due to the change in speed, Myopia -short sighted , Defect of eye where distance objects appear blurred- images focuses before retina , Hypermetropia - long sighted, Defect of eye where near objects appear blurred as images are focused behind the retina.

Light -Key terms

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