أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٤_ m

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter 4_ M


microwaves
microondes fpl

Microwaves. A region of the spectrum of electromagnetic waves, in which the wavelength is approximately between 1 millimeter and 10 metres, and its frequency ranges between 107 and 1012 Hz. Microwave sources include diodes called klystrons, and their uses also include radar and special cooking ovens (here the wavelengths are strongly absorbed by hydrogen atoms in food. Microwave sources and detectors are commonly used in teaching the behavior of waves.


mirage
mirage m

A mirage is a reflection effect and a total internal reflection. This effect is seen when the air near the Earth's surface is hotter than that farther from the surface. When light approaches the Earth, it bends away from it. An image appears on the other side of the surface. The image of the sky looks like a pool of water.


mirror
miroir m

Mirror. An optical element that bends light by reflection. Flat mirrors reflect parallel rays as parallel rays. Converging mirrors collect rays. While “diverging mirrors” spread the rays. It is for close-up mirrors
“concave” surfaces, and those spacings have “convex” surfaces.

Flat mirror
close-up mirror (concave)
Divergent mirror (convex)

We use rays diagrams to find an image of the body formed by a curved mirror.

* (pole) is the center of the mirror.
* (axis) is the line passing through (P) perpendicular to the surface of the mirror.
* (Focal point) is where incoming rays pass close to the axis and parallel to it, or appear to pass, after reflection, and FP is the focal distance.

* (c) center of curvature) is the point where all the perpendicular rays on the surface meet the axis, and its distance from P is twice the distance F from it.

* (O) object) is the source of the rays
Relationship .
* (I) image) is the place from which it appears as if the rays are coming.

Curved mirrors are used in many optical instruments. Grooming or shaving mirrors are close-up mirrors, while car driving mirrors are spaced mirrors, as shown in the figure above.


moderator
ralentisseur m

Soothing. See nuclear power.


molecule
molécule f

molecule. A group consisting of one or more atoms interconnected. It is the basic particle of matter. Most molecules are complex systems that cannot be described accurately.