Question

a magician during a show makes a glass lens with n=1.47 disappears in a trough of liquid. what is the liquid?
A.water
B.Turpentine oil
C.Kerosene
D.Coconut oil​

Answer 1

Answer:

B.Turpentine oil

Explanation:

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Answer 2

the refractive index of the liquid must be equal to 1. 47 in order to make the lens disappear.this means n1 =n2 . this gives 1/f = 0 or f--> infinity . the lens in the liquid will act like plane sheet of glass no. the liquid is not water .