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The phenomenon of refraction is associated with the change of velocity of light. When a ray of light is incident normally on a glass slab, change in velocity of light takes place. Then state why there is no change in the direction of light. |
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Answer» Solution :Suppose, v and v. are the velocities of light in vacuum and glass MEDIUM RESPECTIVELY . According to Snell.s law, `(SINI)/(sinr) = (v)/(v.) or, sinr = (v.)/(v) sin i` For normal incidence, I = 0 `therefore "" sini = 0 therefore sinr = 0 or, r = 0` So, for normal incidence through change in velocity takes place, there is no change in direction- since both the angleof incidence and the ANGLE of refraction are zero. |
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