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Refraction of Light 1. Refraction : The phenomenon, due to which a ray of light deviates from its original path, while travelling from one optical medium to another is called refraction. 2. Rules for the change in the path of rays while travelling from one medium to another : (i) When a ray of light travels obliquely from optically rarer medium to optically denser medium, it always bends towards the normal, at the point of incidence. (ii) When a ray of light travels obliquely from optically denser medium to optically rarer medium, it always bends away from the normal, at the point of incidence. (iii) When a ray of light strikes another optical medium at right angles, it does not suffer any refraction. 3. Laws of refraction : (a) Snell s Law : It states that, the ratio between all the values of sine of angle of incidence (in air) and the sine of angle of refraction in another optical medium is a constant quantity. (b) The incident ray, the refracted ray and the normal, lie in the same plane, at the point of incidence. Class-X 1 Key points
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