How can a lens collimate an image instead of just a point of light? A lens cannot collimate an image It can take the light from each point of the image into a collimated beam in a different direction Your eye can take a collimated beam and focus it to a point on your retina It can take beams in different directions and focus each to a different point, thus reconstructing the image
What is the best way to collimate light emitted by a LED? Put simply: the main factors here are that if you design your collimation optics to collimate output from the centre of the chip (i e a light emitted from a point on the chip centre will become an on-axis plane wave at the collimator output), light from point sources at the sides of the chip will be mapped to slanted plane waves
optics - Why cant incoherent light be collimated as well as laser . . . $\begingroup$ While you can collimate an LED, the fact remains that the because the LED has a much (much) larger angular spread than a laser, you just can't collimate it nearly as well So, perhaps you can get an LED down to a few degrees, but the laser will be in tenths of a degree
What type of lens is used to collimate light? It's difficult to further collimate such a beam I succesfully got better collimated beams from LEDs by grinding the front part, thus making a flat surface for the output of the light, and putting a lens after it
Is it possible to collimate a point source of concentrated light? You can form a small image of the sun, and then collimate the light from that image, but the image will not be infinitely small Perhaps the simplest way to understand why this is so is to realize the sun has an angular extent in the sky Using the common language, the sun is an "extended source"
Lasers and Collimation - Physics Stack Exchange Following John Rennie's answer I read the 1st paragraph of Collimated light at Wikipedia Last 3 lines stated that "Collimated light is sometimes said to be focused at infinity Thus as the distance from a point source increases, the spherical wavefronts become flatter and closer to plane waves, which are perfectly collimated "
optics - Does an aspheric lens require that the incident light be . . . Every lens can focus or collimate light, but in a normal lens you have spherical abberation That means, if you have incoming parallel light, the rays farther away from the optical axis (hitting the lens towards the edges) have a slightly different focal point than rays closer to the optical axis
Can the neutrons in a nuclear reactor be collimated? Yes, it is possible to collimate reactor neutrons and this is very common in research reactors See "beam tubes", "guide neutrons", "hot and cold sources" It is even possible to sort them in velocity to obtain mono-energetic neutrons
Min spot size for light collimated from an optical fiber? $\begingroup$ You don't want to collimate your fiber output, you want to image onto some target The easiest way to do that is probably collimate the output from the fiber, then use a 2nd lens to focus it onto the target But the diameter of the collimated beam is not particularly relevant to the size of the final focused spot $\endgroup$
Focusing white LED light into a spot as small as possible As S Mcgrew stated, consider this as an imaging problem If you collimate with an f=50 lens, and focus that with a f=100 mm lens, the nominal magnification is 2 (well, -2 if you were keeping track of signs) Hence a 1 mm aperture is imaged to a 2 mm image size Some aberrations will increase that slightly