Find the time taken by a monochromatic light to cross a transparent slab of width 2 m and R.I. = 2 as shown in figure :-

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 4/(3√3) × 10⁻⁸ s. Therefore the correct option is C.