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Τι (ποιος) είναι REFRACTION - 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

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

refraction

n.

eye examination

to do a refraction (the oculist did a refraction)

refraction

n.

Deflection (of rays), deviation.

Refraction

·noun The act of refracting, or the state of being refracted.

II. Refraction ·noun The correction which is to be deducted from the apparent altitude of a heavenly body on account of atmospheric refraction, in order to obtain the true altitude.

III. Refraction ·noun The change in the direction of ray of light, heat, or the like, when it enters obliquely a medium of a different density from that through which it has previously moved.

IV. Refraction ·noun The change in the direction of a ray of light, and, consequently, in the apparent position of a heavenly body from which it emanates, arising from its passage through the earth's atmosphere;

- hence distinguished as atmospheric refraction, or astronomical refraction.

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 REFRACTION

1. They have cuts on both sides to maximize the light refraction within them.

2. The mosquito‘s soft tissues, insides and blood were clearly shown on the screen due to refraction contrast –– a more powerful way of imaging than X–rays.

3. The concept begins with refraction –– a quality of light in which the electromagnetic waves take the quickest, but not necessarily the shortest, route.

4. Leonhardt said the underlying principle was inspired by natural phenomena when light is bent to create optical illusions such as the refraction of a spoon in water or a mirage in the desert or on hot tarmac.

5. This is more likely an ice bow, formed by refraction of light through ice crystals in the atmosphere, rather than reflection of light back from falling drops of rain. – Giles Robinson, Sheffield, UK Add your comment Name: Your email address will not be publishedEmail: Town and country: Terms and conditionsYour comment: make text area biggerYou have characters left.