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An object lies 100 cm inside water (mu=4...

An object lies 100 cm inside water `(mu=4//3)`. It is viewed from air nearly normally. Find the apparent depth of the object.

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Here object is placed inside water and the observer is situated in air. Hence, apparent depth
`d^(')=d/((n_(i)//n_(r)))=d/((n_("water")/n_("air")))=d^(')= d/n_("relative")=100/((4//3)/1)=75cm`
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