Final answer:
The correct answer to the question is Rayleigh's Criterion, which is a principle used to calculate the diffraction limit to resolution in optical instruments. It defines when two point sources are just resolvable based on their diffraction patterns.
Step-by-step explanation:
The principle related to resolution that is expressed by the equation θ = 1.22 λ/D is known as the Rayleigh's Criterion. This criterion is used to determine the diffraction limit to resolution in optical systems, such as telescopes and microscopes. According to the Rayleigh criterion, two point sources of light are considered to be just resolvable when the principal maximum of the diffraction pattern of one image coincides with the first minimum of the diffraction pattern of the other image.
Ohm's Law is unrelated to optical resolution and instead defines the relationship between voltage, current, and resistance in electrical circuits. Snell's Law deals with the refraction of light and the relationship between the angle of incidence and refraction when light passes through different media. Therefore, the correct answer to the question is c) Rayleigh's Criterion.