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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-

1. 2 1 2 1 n n ) n n ( d 2 + +
2. 2 1 2 1 n n 2 ) n n ( d +
3. ) n n ( 2 n dn 2 1 2 1 +
4. ) n n ( n dn 2 1 2 1 +

Correct answer: 2 1 2 1 n n 2 ) n n ( d +

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