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How is a photon of light able to convey an image (or a bit of it)?
Can it carry this image over an indefinite distance through space?
Why does the image stay intact over such great distances and not dissipate?
Hi Pmb,Got it from astronomers, who would say that they have "seen" a star or cosmic object, whose image has travelled billions of light years to get to the Earth......
Two point sources are regarded as just resolved when the principal diffraction maximum of one image coincides with the first minimum of the other. If the distance is greater, the two points are well resolved and if it is smaller, they are regarded as not resolved. If one considers diffraction through a circular aperture, this translates into: where θ is the angular resolution in radians, λ is the wavelength of light, and D is the diameter of the lens' aperture.
Estimates vary, but it is said that it can take of the order of a million years for light energy to percolate from the center of the sun to the visible surface, so it tells astronomers very little about what is happening in the sun now.
Light interacts so strongly with matter that it is actually not the best technique for seeing some astronomical phenomena.
Individual photons to the best of my knowledge can not interact in any way and survive.
Hi Everyone! I just finished reading that entangled photons communicate in a way not currently understood; and transmit information to each other 100k times faster than the speed of light! Ken
Mike - of course the number of photon once it slips below a threshold will lead to image loss. As will red-shift - look a the equation I posted above - at longer wavelengths less angular resolution is possible for the same size light gatherer. And please stop postulating about the sensitivities of inanimate massless particles (they hate it) and it is pure speculation - and please do not take this thread o/t by arguing that it is good physics