Reflaction:
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When a wave of light after incidenting on a boundary separating two media come back into the same media, then this phenomenon, is called reflection of light.
(i) ∠i = ∠r
(ii) After reflection, speed, wave length and frequency of light remains same but intensity decreases.
(iii) There is a medium change of if reflection takes place from denser medium.
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Refraction:
The bending of the light wave passing from one medium to the other medium is called refraction.
(i) The refraction of light held on going from one medium to another because the speed of light is different in the two media.
(ii) Larger the difference in the speeds of light in the two media, greater will be the amount of refraction.
(iii) A phase in which the speed of light is more is known as optically rarer medium and a medium is which the speed of light is less, is known as optically denser medium.
(iv) When a light wave goes from a rarer phase to a denser medium, it bends towards the normal.
(v) When a light wave goes from a denser medium to a rarer medium, it bends away from the normal.
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