From the pin hole to the collimator
How does light propagate?
The first mistake is to teach young children and people that light travels in straight lines . The way like troubles is as a radiating disturbance from the point source. The radiating disturbance is A trochoid surface that expands from the point source. A light source or a reflecting source is made up of many point Sources. So the wave front is made up of an interference pattern of spherical Trochoid surfaces.
When this interference pattern hits a surface it is absorbed and then re-transmitted either as a Reflection or as a scattered pattern of light. Where the interference pattern meets a translucent material it becomes absorbed and re-transmitted through the material in the way which we call Refraction.
However if the lightht continues hrough a small openings and in the same medium The interference pattern becomes Diffracted near the Boundary of the small pin hole, The interference pattern is absorbed and re-transmitted at the Boundary, and the retransmission interferes with the existing interference pattern which is passing through. The Result is that the hole becomes a new point source. This source now transmits a complex interference pattern onto a surface which we can interpret as an inverted image.
If instead of a pinhole a small slit is used then the image becomes blurred because the interference pattern from the top of the slit to the bottom of the slip is made up of multiple overlapping point sources. The rotations will therefore interfere in a wavelike motion which we interpret as a blur.
A translucent lens is not a pinhole, however when it focuses the light to a point then the point acts like a point source and so acts like a virtual pinhole.
By focusing to a pin hole the image appears on the screen or Retina. However past that focal point light will continue to expand. The interference pattern becomes increasingly blurred, and the image is lost in a flood of non collimated light. This does not occur in a pinhole camera. The pinhole is fixed so the pattern emerges from a fixed position in space.
Collimator takes a “pinhole focus “ and prevents the light from expanding. It directs the light in a given direction onto a screen.
It is known that certain energetic sources form interference patterns which are too powerful to be focused by any optical lens. In this case a collimator is used to provide multiple point sources. The reduction in power allows the point sources to create an interference pattern which can be detected clearly on the screen. The multiple sources act like a single point source if the diffraction pattern is set up to interfere correctly.
We need to understand the collimating effect of an impedance surface in the magnetic flux
we also need to understand how a translucent lens through its dispersion effect by refraction enables the collimated interference patterns to align correctly in the magnetic flux.
The second refraction in the lens collimates the interference pattern in a certain direction, And those second refraction points sources act as a diffraction grating
How appoint source can be colimated Buy a lens, and why refraction is associated with diffraction.
Absorption and retransmission associated with diffraction at the LHC