A transparent cube of glass of refractiv...

A transparent cube of glass of refractive index `mu` and thickness t is placed on a spot of ink drawn on a white paper, When the spot is viewed from above (air) normally, the spot appears to shift through a distance of `Delta`t towards the observer. What is the value of `Delta` t ?

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The correct Answer is:

`(l - (1)/(mu))t`

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