A metal plate is lying at the bottom of a tank full of a transparent liquid. Height of tank is 100 cm but the plated appears to be at 45 cm above bottom. The refractive index of liquid is:
Answer & explanation
Correct answer: option 3
Real depth of plate, H = 100 cm
Apparent depth of plate, h = 100 – 45 = 55 cm
∴ Refractive index of fluid = $\frac{H}{h} = \frac{100}{55}$ = 1.81