Let's first understand what focus or accommodation is. We have been learning since our school days that light is a ray, wave, particle, it has a dual nature, etc, etc. And lately we have also known the famous and undebatable theory on light by Richard P Feynman et al, that the dual nature of light can be explained by considering light as a particle having an instantaneous phase (which gives it the properties of a wave) associated with it. This theory is called the QED; Quantum Electro Dynamics and it promises to combine the particle and wave theories of light into one single entity that can explain almost all phenomenon of light to its highest possible accuracy. Interested people can read his own book called "QED: The Strange Theory of Light and Matter", which has his famous lectures.
But why am saying all this? When I focus light, I am bringing together light from a region to a point and to analyze this I need to decide on the theory. For now I will not get into the complex QED, but will try to justify my experiments with simple ray diagrams. Will come to QED after some more posts.
Imagine that we did not have eye ball or in other words the lens of our eyes, but just had the retina to capture the light from the surrounding. How would the surrounding appear to you? There is one way to experiment this (ofcourse not by removing the lens of your eyes :)). If you have a webcam just try removing the lens of it and switch it on exposing the retina, sorry the sensor to the surrounding. What do you see?
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