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The ring flash (usually LED [citation needed]) is mounted on the objective lens of an optical microscope. The main use of this tool is the photographing of microscopic organisms [citation needed]. A ring flash works on a microscope in much the same way as it does on a camera; it reduces reflections while bathing the subject in light.
In visual perception, flicker is a human-visible change in luminance of an illuminated surface or light source which can be due to fluctuations of the light source itself, or due to external causes such as due to rapid fluctuations in the voltage of the power supply (power-line flicker) or incompatibility with an external dimmer.
Flicker is however a directly visible effect resulting from light modulations at relatively low modulation frequencies, typically below 80 Hz, whereas stroboscopic effect in common (residential) applications may become visible if light modulations are present with modulation frequencies, typically above 80 Hz.
Newton's rings observed through a microscope. The smallest increments on the superimposed scale are 100 μm. The illumination is from below, leading to a bright central region. Newton's rings interference pattern created by a plano-convex lens illuminated by 650 nm red laser light, photographed using a low-light microscope. The illumination is ...
The sinc function, the impulse response for an ideal low-pass filter, illustrating ringing for an impulse. The Gibbs phenomenon, illustrating ringing for a step function.. By definition, ringing occurs when a non-oscillating input yields an oscillating output: formally, when an input signal which is monotonic on an interval has output response which is not monotonic.
Bright-field microscopes have low apparent optical resolution due to the blur of out-of-focus material; Bright-field microscopes typically produce low contrast with most biological samples, as few absorb light to a great extent. Samples that are naturally colorless and transparent cannot be seen well, e.g. many types of mammalian cells.
15 kW xenon short-arc lamp used in IMAX projectors High-speed, slow-motion video of a xenon flashtube recorded at a speed of 44,025 frames per second.. A xenon arc lamp is a highly specialized type of gas discharge lamp, an electric light that produces light by passing electricity through ionized xenon gas at high pressure.
A computer-simulated ring resonator depicting continuous wave input at resonance. An optical ring resonator is a set of waveguides in which at least one is a closed loop coupled to some sort of light input and output. (These can be, but are not limited to being, waveguides.)
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