A small pin fixed on a table top is viewed from above from a distance of `50 cm`. By what distance would the pin appear to be raised, if it be viewed from the same point through a `15 cm`. Thick glass slab held parallel to the table? `mu` of glass is `1.5`. Does the answer depend on location of the slab ?
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Here, real depth, `x = 15 cm`, apparent depth, `y = ?, mu = 1.5` As `mu = (x)/(y) :. y = (x)/(mu) = (15)/(1.5) = 10 cm`. Distacne through when the pin appear to be raised `= x - y = 15 - 10 = 5 cm` The answer does not depend upon the location of the slab.
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