A vessel of depth d is half filled with oil of refractive index n 1 and the other half is filled with water of refractive index n 2 . The apparent depth of this vessel when viewed from above will be-

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The apparent depth formula is given by n = R e a l d e p t h A p p a r e n t d e p t h . The apparent depth in this case is given by d ' = d 1 n 1 + d 2 n 2 ⇒ d ' = d 2 ( 1 n 1 + 1 n 2 ) ⇒ d ' = d 2 ( n 1 + n 2 n 1 n 2 )

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