the path length of an object in motion in a given time is the length of actual path traversed by the object in the given time.
You're asking about two different branches of physics. Optics is the study of light. The interaction of light with matter is more properly Solid State Physics.
Variously: physics, optics, quantum mechanics, etc.
Ray Ray
Incident light ray
Quantum physics determined that light acts like an electromagnetic wave and a particle at the same time.
light takes a straight path.
the path length of an object in motion in a given time is the length of actual path traversed by the object in the given time.
You're asking about two different branches of physics. Optics is the study of light. The interaction of light with matter is more properly Solid State Physics.
use a mirror to change the path of light.
how does water affect light path
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The main relevant physics in this case is reflection of light.
what is the path of light
Light and electricity follow the path of least resistance.
the physics colours are red green and blue
Yes. But the path of light across the water/air boundary is not.