A glass slab of width ‘t’, refractive index ‘μ’ is placed as shown in the figure. If the point object, moves with a speed 2 cm s⁻¹ towards the slab the speed observed will be

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 cm s⁻¹. Therefore the correct option is A.