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Τι (ποιος) είναι REFRACTIVE - ορισμός

PHYSICS; CHANGE IN DIRECTION OF A WAVE

Refracted; Refract; Refractive; Apparent depth; Refringence; Refracting; Refraction of waves; Light refraction; Refrection of light; Refractions; Light Refraction; Refraction of light; Optical surfaces; Refracts; Wave refraction

$Water waves are almost parallel to the beach when they hit it because they gradually refract towards land as the water gets shallower.$
$The sun appears slightly flattened when close to the horizon due to refraction in the atmosphere.$
$An image of the [[Golden Gate Bridge]] is refracted and bent by many differing three-dimensional drops of water.$
$A pen partially submerged in a bowl of water appears bent due to refraction at the water surface.$
$A pencil part immersed in water looks bent due to refraction: the light waves from X change direction and so seem to originate at Y.$
$2D simulation: refraction of a quantum particle.The black half of the background is zero potential, the gray half is a higher potential. White blur represents the probability distribution of finding a particle in a given place if measured.$
$A ray of light being refracted in a plastic block.$
$Refraction of light at the interface between two media of different refractive indices, with n<sub>2</sub> > n<sub>1</sub>. Since the phase velocity is lower in the second medium (v<sub>2</sub> < v<sub>1</sub>), the angle of refraction θ<sub>2</sub> is less than the angle of incidence θ<sub>1</sub>; that is, the ray in the higher-index medium is closer to the normal.$

refractive

a.

Refracting.

Refractive

·adj Serving or having power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers.

Refractive surgery

MEDICAL SPECIALTY

Femtosecond laser intrastromal vision correction; Refraction operation; Refractory surgery; Refraction surgery; FLIVC; Refractive eye surgery; Corrective eye surgery; Refractive lens exchange

Refractive eye surgery is optional eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses. This can include various methods of surgical remodeling of the cornea (keratomileusis), lens implantation or lens replacement.

https://en.wikipedia.org/wiki/Refractive_surgery

Βικιπαίδεια

Refraction

In physics, refraction is the redirection of a wave as it passes from one medium to another. The redirection can be caused by the wave's change in speed or by a change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation relative to the direction of change in speed.

For light, refraction follows Snell's law, which states that, for a given pair of media, the ratio of the sines of the angle of incidence θ₁ and angle of refraction θ₂ is equal to the ratio of phase velocities (v₁ / v₂) in the two media, or equivalently, to the refractive indices (n₂ / n₁) of the two media.

{\frac {\sin \theta _{1}}{\sin \theta _{2}}}={\frac {v_{1}}{v_{2}}}={\frac {n_{2}}{n_{1}}}

Optical prisms and lenses use refraction to redirect light, as does the human eye. The refractive index of materials varies with the wavelength of light, and thus the angle of the refraction also varies correspondingly. This is called dispersion and causes prisms and rainbows to divide white light into its constituent spectral colors.

https://en.wikipedia.org/wiki/Refraction

Παραδείγματα από το σώμα κειμένου για REFRACTIVE

1. Log on to www.culture.gr. – The European Society of Cataract and Refractive Surgeons (ESCRS) hosts the 11th winter Refractive Surgery Meeting which opens at '.30 a.m. at the Athens Concert Hall.

2. Instead of having a positive refractive index – the property which makes light bend as it passes through a prism or water – the materials have a negative refractive index, which effectively makes light travel backwards.

3. A superlens has a negative refractive index, meaning light that hits it reverses and goes in the opposite direction.

4. Instead, he turned to Refractive Lens Exchange (RLE), a technique which has been used for decades to deal with cataracts.

5. About '5 percent of patients report being satisfied with the outcome, according to the American Society of Cataract and Refractive Surgery, which represents doctors who perform the procedures.