NEET Physics Ray Optics and Optical Instruments Questions Solved

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index 

(a)equal to that of glass

(b)less than one

(c)greater than that of glass 

(d)less than that of glass

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