In the context of classical physics, a photon is often described as a particle of light. Photons are considered to be fundamental particles that carry electromagnetic energy. When light propagates, it behaves as an electromagnetic wave, and photons are the individual quanta or packets of energy associated with that wave.
Regarding your question, it is important to note that the behavior of photons is governed by the principles of quantum mechanics. In quantum mechanics, the position and momentum of particles, including photons, are described by wave functions. The wave function of a photon represents a probability distribution, indicating where the photon is likely to be found if measured.
In this framework, it is not accurate to say that a photon is an expanding wave-sphere in the classical sense. The wave function of a photon does exhibit wave-like properties, but it is not a physical wave propagating through space.
As for your question about both eyes seeing the same photon, it is theoretically possible for both eyes to detect the same photon. However, the probability of this happening depends on various factors, including the nature of the light source, the distance to the object emitting the photon, and the geometry of the eyes and their positions relative to the light source.
When light enters the eyes, it interacts with the light-sensitive cells (photoreceptors) in the retina. The photons may be absorbed by these cells, triggering a chemical and electrical response that ultimately leads to visual perception. Each eye receives light independently, and the photons that enter one eye are not directly shared with the other eye.
In certain situations, such as when both eyes are focused on the same object emitting photons, there is a chance that photons from that object can be detected by both eyes. However, the specific path of a photon and whether it will be detected by both eyes is probabilistic in nature and depends on a range of factors.
It's worth noting that the interpretation of quantum mechanics can be complex and philosophical, and different interpretations may exist. The wave-particle duality of photons is a fundamental aspect of quantum mechanics, and while photons can exhibit wave-like properties, their behavior is ultimately described by probabilistic wave functions.