Definitions

1. A wavelength is the distance traveled through space by the wave during of a single oscillatory cycle.
2. Wavelength is an important way to characterize a wave.
3. Wavelength is the physical distance covered by one cycle of the wave.
4. Wavelength is the distance between one wave crest to the next. (Web site)
5. Wavelength is decreased in a medium with higher refractive index. (Web site)

Phase

1. If two waves of the same wavelength and frequency are in phase, both the wave crests and wave troughs align. (Web site)
2. The light generated by stimulated emission is very similar to the input signal in terms of wavelength, phase, and polarization.

Troughs

1. Wavelength: The distance between two troughs or two peaks in any wave. (Web site)
2. A wave consists of successive troughs and crests, and the distance between two adjacent crests or troughs is called the wavelength. (Web site)

Size

1. At low momentum, the wavelength of an electron is much larger than the size of the proton.
2. Lateral color is a change in magnification or image size with wavelength, and is not related to axial color.
3. The size of an Airy disc in the specimen plane depends on wavelength and the numerical aperture of the objective lens.

Focal

1. Because the index of refraction varies with wavelength, the focal length of a lens also varies and causes longitudinal or axial chromatic aberration.
2. Focal length is, strictly speaking, specific to a given wavelength, even different glasses will focus the same wavelengths at different focus points.
3. This achieves substantial chromatic aberration to shift the focal length with wavelength. (Web site)

Optical Power

1. Optical power is a function of both the number of photons and the wavelength.
2. Peak Wavelength - The wavelength at which the optical power of a source is at a maximum. (Web site)

Fluorescence

1. Fluorescence is the process where light, such as visible light, is absorbed by a molecule and re-emitted at a longer wavelength to generate distinct colors.
2. At this specific wavelength, clean healthy tooth structure exhibits little or no fluorescence, resulting in very low scale readings on the display. (Web site)

Spectroscopy

1. Spectroscopy was originally the study of the interaction between radiation and matter as a function of wavelength (λ).
2. Spectroscopy was originally the study of the interaction between radiation and matter as a function of wavelength (λ). (Web site)
3. In fact, historically, spectroscopy referred to the use of visible light dispersed according to its wavelength, e.g.

Red

1. If the source of light is moving away from you then the wavelength of the light is stretched out, i.e., the light is shifted towards the red. (Web site)
2. Red has the longest wavelength and violet has the shortest wavelength. (Web site)
3. Wavelength increases up towards the red and beyond (frequency decreases). (Web site)

Violet

1. The forward potential of these diodes depends on the wavelength of the emitted photons: 1.2 V corresponds to red, 2.4 to violet.
2. Another method of blocking off the unwanted blue and violet is to use dark-field illumination, so that no direct light of any wavelength can get through.
3. Violet at one end has the shortest wavelength and red at the other end has the longest wavelength of visible light. (Web site)

Colors

1. Looking at light through a prism separates visible light into its colors according to wavelength. (Web site)
2. However, except for various shades of red (depending on wavelength), all other colors are very expensive. (Web site)
3. Note that white light, such as sunlight, is a mixture of light of all colors, so it does not have a characteristic wavelength. (Web site)

Visible Light Spectrum

1. Ultraviolet radiation: Electromagnetic radiation of a wavelength just shorter than the violet (shortest wavelength) end of the visible light spectrum. (Web site)
2. The reference wavelength is usually the wavelength of maximum absorption in the ultraviolet or visible light spectrum. (Web site)
3. The visible light spectrum is centered at about 550 nanometers, the dominant wavelength for green light (our eyes are most sensitive to green light). (Web site)

Function

1. There is also the excitation spectrum, which represents how strongly the fluorophore absorbs fluorescence-exciting light as a function of its wavelength. (Web site)
2. The excitation spectrum is a measure of the efficiency of electronic excitation as a function of excitation wavelength. (Web site)
3. Scattering varies as a function of the ratio of the particle diameter to the wavelength of the radiation.

Luminosity Function

1. The standardized model of the eye's response to light as a function of wavelength is given by the luminosity function. (Web site)
2. The peak of the luminosity function is at 555 nm (green); the eye is more sensitive to light of this wavelength than any other. (Web site)

Semiconductor Lasers

1. Like other semiconductor lasers, these light sources will emit radiation at the wavelength near the bandgap energy (for GaAs 875 nm or near infra red). (Web site)

Different Wavelength

1. When the light meets a change in tooth substance, it stimulates fluorescent light of a different wavelength. (Web site)
2. If the laser encounters a decayed area, it will reflect emission of light of a different wavelength.
3. For visible light, light of different colors means light of different wavelength. (Web site)

Different Wavelengths

1. Two target zones 561 and 562 are shown, and are spaced apart to receive different wavelengths of the wavelength separated, redirected, radiant energy. (Web site)
2. For different wavelengths, the separation is proportional to wavelength. (Web site)

Interference Pattern

1. Thus, if the wavelength of the light is known, the slit separation can be determined from the interference pattern or fringes, and vice versa. (Web site)

Microwave Radiation

1. By analyzing the interference pattern we found a value for the wavelength of the microwave radiation of 2.85 cm.
2. Microwave radiation is in the wavelength range from 30 centimeters to 1 millimeter.

Spherical Aberration

1. An achromat will also have spherical aberration corrected at one wavelength of light -- usually green. (Web site)
2. This is called correcting for spherochromatism (the variation of spherical aberration with a change in wavelength). (Web site)
3. Lenses in which both spherical aberration and coma are minimized at a single wavelength are called bestform or aplanatic lenses. (Web site)

Longitudinal Chromatic Aberration

1. That is, the positive diffractive lens has a longitudinal chromatic aberration such that back focus increases as wavelength becomes shorter.
2. Longitudinal chromatic aberration (axial color) is an axial shift in the focus position with wavelength.

Light Waves

1. Light waves stimulate the human eye in different degrees, depending on the wavelength of the light.
2. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.

Light Wave

1. The two elements of a light wave which can actually be detected by the human eye are the wavelength and amplitude. (Web site)
2. The distance from one person to her neighbor would be the wavelength of the wave and the water would be the medium into which the light wave is traveling.
3. Describe what is meant by the wavelength and frequency of a light wave. (Web site)

Band Gap

1. The band gap (or the In density) of the quantum well layer isvaried according to the wavelength of emitted light.
2. In order to change the wavelength of emitted radiation, the band gap of the semiconducting material utilized to fabricate the LED must be changed. (Web site)
3. Gallium arsenide has a band gap of approximately 1.4 electron-volts, and emits in the infrared at a wavelength of 900 nanometers. (Web site)

Band Gap Energy

1. The wavelength of the light emitted, and therefore its color, depends on the band gap energy of the materials forming the p-n junction. (Web site)
2. The band gap energy is inversely proportional to the wavelength of light emitted from a semiconductor. (Web site)
3. Quantum loss (long wavelength): This is the loss in photon energy wherein hf is less than the band gap energy E.sub.g. (Web site)

Diffraction Grating

1. Unless otherwise indicated, the efficiency of a diffraction grating is measured in the Littrow configuration at a given wavelength.

Diffraction

1. The photon displays clearly wave-like phenomena such as diffraction and interference on the length scale of its wavelength. (Web site)
2. The ultimate resolution limit of an optical telescope depends on the aperture and the wavelength of light being observed and is caused by diffraction.
3. Diffraction always follows Bragg's Law {n*Wavelength=2*Spacing of fixed objects*sin(angle of scattering)}.

Measure

1. Angstrom: A unit of length equal to one ten-billionth of a meter (about four-billionth of an inch); often used to measure the wavelength of light. (Web site)
2. From this, it is fairly easy to measure how the index depends on wavelength (or frequency). (Web site)
3. He discovered the Abbe number, a measure of any transparent material's variation of refractive index with wavelength. (Web site)

Absorbance

1. This wavelength dependence of absorbance enters Beer's Law through the extinction coefficient, which is a function of wavelength. (Web site)
2. Because sulindac absorbs very strongly at this wavelength, the loss of absorbance at 340 nm could not be measured directly. (Web site)
3. The progress of clotting is measured optically by measuring the absorbance of a particular wavelength of light by the sample and how it changes over time.

Scattered

1. The size of these dust particles is approximately the same as the wavelength of visible light; therefore, this light is strongly scattered.
2. Reflectance spectroscopy is the study of light as a function of wavelength that has been reflected or scattered from a solid, liquid, or gas.
3. Compton effect: the increase in the wavelength of electromagnetic radiation when it is scattered by free electrons. (Web site)

Blue Light

1. For example, the wavelength of blue light is roughly half that of red light, but the waves corresponding to the two colors are otherwise identical. (Web site)

Lower Frequency

1. The longer wavelength, lower frequency passes through the entire aperture (such as near-infrared light). (Web site)

Infrared Light

1. Infrared light has a longer wavelength (and so a lower frequency) than that of red light visible to humans, hence the literal meaning of below red. (Web site)
2. A photon of infrared light, having a lower frequency (longer wavelength), will deliver a lower amount of energy—only enough to warm one's skin. (Web site)

Laser Light

1. Laser light consists of essentially one wavelength, having its origin in stimulated emission from one set of atomic energy levels.
2. A lithium niobate crystal can be made to fluoresce in red, yellow, and green by pumping it with laser light having a wavelength of 488 nanometers.
3. Laser light is typically near- monochromatic, i.e., consisting of a single wavelength or color, and emitted in a narrow beam.

Grating

1. This grating is so designed that for a wavelength or color of the zeroth order, the optical depth is a multiple of 2.pi.
2. For a given grating, light with a larger wavelength generally has a larger diffraction angle.
3. Each different wavelength comes off of the grating at a slightly different angle. (Web site)

Dispersion

1. The effect of dispersion on the focal length of a lens can be examined by calculating the change in the focal length with wavelength. (Web site)
2. Infrared light with a wavelength around 1,330 nm (least dispersion) or 1,550 nm (best transmission) are the best choices for standard silica fibers. (Web site)
3. The most familiar form of dispersion is a decrease in index of refraction with increasing wavelength, which is seen in most transparent materials. (Web site)

Resolution

1. The resolution is directly proportional to the wavelength being observed and inversely proportional to the diameter of the telescope.
2. Resolution, which can also be expressed as beam width, is a function of the wavelength of the signal and the diameter of the reflector. (Web site)
3. There is also an inherent theoretical limit to resolution imposed by the wavelength of visible light (400-600nm). (Web site)

Yellow Light

1. In photopic vision, the human eye is the most sensitive to green and yellow light at a wavelength of 555 nanometers. (Web site)
2. For example, in the case of yellow light with a wavelength of 580 nm, for a resolution of 1", we need D = 12 cm.

Reflectivity

1. The reflectivity as a function of wavelength depends on both the thickness of the coating and on how it is applied. (Web site)
2. The reflectivity of the mirror coating can be measured using a reflectometer and depends on the wavelength of light as well as the metal.
3. The reflectivity of mirror surfacesdoes not change significantly with wavelength.

Incident Light

1. When surface imperfections are smaller than the wavelength of the incident light, as in the case of a mirror, virtually all of the light is reflected. (Web site)
2. The fluorochromes emit light of a given wavelength when excited by incident light of a different (shorter) wavelength. (Web site)
3. The focal point or magnification of a lens varies according to the wavelength of each type of incident light. (Web site)

Rayleigh Scattering

1. In contrast to Rayleigh scattering or Dipole scattering, the Mie theory embraces all possible ratios of diameter to wavelength.
2. A feature of Rayleigh scattering is that the scattered flux is inversely proportional to the fourth power of the wavelength.
3. A subwavelength particle is a particle smaller than the wavelength of light with which it interacts (see Rayleigh scattering). (Web site)

Scattering

1. Scattering occurs when energy at a specific wavelength contacts an object about the same size as the wavelength of the incident radiation. (Web site)
2. For scattering by particles similar to or larger than a wavelength, see Mie theory or Discrete dipole approximation (they apply to Rayleigh regime as well). (Web site)
3. Refractive processes take place in the physical optics limit, where the wavelength of light is similar to other distances, as a kind of scattering. (Web site)

Lens

1. Resolution in optical instruments is dependant on the aperture of the lens or mirror and the wavelength of the light observed. (Web site)
2. Resolution is limited by the light gathering power of the lens (numerical aperture) and the wavelength of the light used. (Web site)
3. The depth of field varies with the focal length of the lens and its f-stop setting or NA; and the wavelength of light.

Light Source

1. Diode detectors are a pain to calibrate unless you have a light source of known energy at the same wavelength you're trying to measure. (Web site)
2. Bandwidth is dependent upon wavelength and type of light source.
3. The wavelength of the light source is preferably in the range of from 300 nm to 1,200 nm. (Web site)

Chromatic Aberrations

1. In particular, prisms are prone to chromatic aberrations which results from the variation in the index of refraction with wavelength.
2. Chromatic aberrations are caused by dispersion, the variation of a lens's refractive index with wavelength. (Web site)
3. Chromatic aberrations are wavelength-dependent artifacts that occur because the refractive index of every optical glass formulation varies with wavelength. (Web site)

Chromatic Aberration

1. In optics, chromatic aberration is caused by a lens having a different refractive index for different wavelength s of light (the dispersion of the lens). (Web site)
2. Chromatic Aberration A change in the aberration behavior of a lens as a function of wavelength. (Web site)
3. It is also known that the chromatic aberration of the diffractive grating is substantially proportional to wavelength.

Nanometers

1. LED colors are often specified in "nm", or nanometers, which is the wavelength of the light. (Web site)
2. Therefore, the cited values of refractive indexes such as 1.33 for water, are based on yellow light at a wavelength of 589.3 nanometers. (Web site)

Categories

1. Science > Physics > Optics > Light
2. Wavelengths
3. Shorter
4. Information > Science > Physics > Radiation
5. Information > Science > Physics > Frequency

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