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[Music] in the previous video we learned what refraction of light is refraction of light is a transmission of light through an object in which the light which is incident obliquely bends at the boundary of the two media we also said that the bending of light in the medium is caused by the change in its speed when light is traveling from an optically rarer medium to an optically denser medium its speed decreases and it bends towards the normal when the light is traveling from an optically denser medium to an optically rarer medium its speed increases and it bends away from the normal in the figure the case above is from optically rarer to denser and the case below is optically denser to rarer but how does the change in speed result in the change of direction of light I did mention in my previous video that we will understand this with the help of an analogy for the next few minutes just forget everything I told you about anything related to light and just concentrate on what I'm about...