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.

Options

A. greater than that of glass
B. less than that of glass
C. equal to that of glass
D. less than one

Answer

C

Explanation

`(1)/(f)=((mu_(2))/(mu_(1))-1)((1)/(R_(1))-(1)/(R_(2)))`
For power `=(1)/(f)=0, mu_(2)=mu_(1)`