A large square container with thin transparent vertical walls is filled with water of refractive index 4/3. A vertical wire is held 12 cm from a corner. Looking from that corner, two images of the wire are seen symmetrically about the line of sight. The separation between the images, in cm, is:

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: Use Snell’s law at each plane interface. For paraxial viewing through a plane surface, apparent depth = real depth × n(observer)/n(object medium). Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 2. Therefore the correct option is A.