It isn't clear what theories you are talking about.
The speed of light is a number. It was a theory before it was measured. After it was measured, and the prediction was found to be correct, it was no longer a theory nor a hypothesis. It became a "physical constant".
Christian Huygens' was one of the first to suggest that light was a wave. His theory, the wave theory of light, stated this, it was opposed by Newton's idea that light was a particle. More recently, scientists such as Thomas Young and Max Planck proved this theory with experiments. So, simply put, the wave theory states that light is a wave, which, as far as we know, is correct.
It is important that the sensor receives the correct amount of light. To restrict the amount of light would produce poor results.
The most modern theory of light is the quantum theory.
compound light microscope - cell theory - electron microscope
this is a much more complicated question than perhaps you realise. try looking up "wave particle duality" photons have the strange characteristic of haveing properties of both a wave and a particle.
newtons law of gravitation mass and weight differences between corpusclur theory and wave light theory uses of carbon dioxide
So that the light path is correct.
That theory states that light behaves as group of particles.
yes it supports the wave theory of light...
It is the wave theory of light that best explains interference. The particle theory has problems when applied to this observable phenomenon.
Light ray theory and shadows. Basically the light ray theory is the theory that light always travels in straight lines, and it is linked into shadows as when an object blocks the light rays it cannot bend round the object therefore making a shadow.