An object is immersed in a fluid. In order that the object becomes invisible, it should (A) beha...

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An object is immersed in a fluid. In order that the object becomes invisible, it should
(A) behave as a perfect reffector
(B) have refractive index exactly matching with that of the surrounding fluid
(C) absorb all light falling on it
(D) have refractive index one
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