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What are the conclusions obtained from l...

What are the conclusions obtained from laws of refraction ?

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(i) The speed of light in a medium is low if the refractive index of the medium is high and vice versa.
(ii) When light travels from a denser medium into a rarer medium, the refracted ray is bent away from the normal drawn to the interface.
(iii) When light travels from a rarer medium into a denser medium, the refracted ray is bent towards the normal drawn to the interface.
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