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An object is immersed in some liquid. Pr...

An object is immersed in some liquid. Prove that
`._(a)n_(l)=("Real depth")/("Aparent depth ")`

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Consider the situation shown in fig. Let a point object O is placed in a medium of refractive index `n_(1)` . Another medium of refractive index `n_(2)` has its boundary at PQ. Consider two light rays OP and OA originating from O. Let OP falls perpendicularly on interface PQ and OA falls at PQ at a small angle i. w.r.t. normal NN'. OP enters the second medium undeviated and OA enters making an angle r w.r.t. normal. When produced backward, these rays meet at I which is the virtual image of O
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