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The optical path of a monochromatic lig...

The optical path of a monochromatic light is the same if it travels through 4 cm of glass or 4.5 cm of water . If the refractive index of galss is 1.5, then the refractive index of water is

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When light travells a distance ‘x’ in a medium of refractive index `mu` , the optical path is `mu` x
Given `mu_(1)x_(1) = mu_(1)x_(2) implies 1.5xx4.00 = mu_(2)xx4.50`
`mu_(2)=(1.5xx4.00)/4.50 = 1.333`
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