Which of the following laws is not related to fluid dynamics?

• A. Bernoulli's law
• B. Poiseuille's law
• C. Snell's law
• D. Doppler's law

Answer: (C)

The correct choice pertains to Snell's law, which describes the relationship between the angles of incidence and refraction when light passes from one medium to another. This law is fundamentally concerned with optics, the study of light behavior, rather than fluid dynamics.

In contrast, Bernoulli's law is related to the principles of energy conservation in flowing fluids and describes the relationship between pressure, velocity, and height in a fluid flow. Poiseuille's law deals with the flow rate of a viscous fluid in a pipe and is essential for understanding fluid movement in various applications. Doppler's law, while primarily associated with waves (like sound or light), is often applied in contexts involving moving fluids, particularly regarding how the frequency of waves changes based on the motion of sources or observers.

Therefore, Snell's law stands apart from the other choices, as its focus is not on the dynamics of fluids but rather on the propagation of light through different media.