Bottles of Perfume Sometimes Have Thick Glass (N = 1

Multiple Choice

Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 2.0 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface?

A) 0.80
B) 0.51
C) 0.72
D) 80
E) 12