Search results
Results from the WOW.Com Content Network
The locations of lunar retroreflectors left by Apollo (A) and Luna (L) missions. Retroreflectors are devices which reflect light back to its source. Six were left at six sites on the Moon by three crews of the Apollo program, two by remote landers of the Lunokhod program, and one by the Chandrayaan program. [1]
These reflect radio waves coming from in front of them back parallel to the incoming beam. To create a corner reflector that will reflect radar waves coming from any direction, 8 corner reflectors are placed back-to-back in an octahedron (diamond) shape.
The basic concept of such systems is that a low-power remote system, such as a sensor mote, can receive an optical signal from a base station and reflect the modulated signal back to the base station. Since the base station supplies the optical power, this allows the remote system to communicate without excessive power consumption.
In physics, backscatter (or backscattering) is the reflection of waves, particles, or signals back to the direction from which they came. It is usually a diffuse reflection due to scattering , as opposed to specular reflection as from a mirror , although specular backscattering can occur at normal incidence with a surface.
A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...
The practice of self-reflection goes back many centuries and is rooted in the world’s great spiritual traditions. Early adherents of such practices include the Christian desert fathers and Japanese samurai. More contemporary proponents included Albert Schweitzer, Ben Franklin, and Bishop Fulton J. Sheen. Franklin, in particular, had a rather ...
Aperture blockage (also known as feed blockage: part of the feed energy is reflected back into the feed antenna and does not contribute to the main beam) Illumination taper (feed illumination reduced at the edges of the reflector) Reflector surface deviation; Defocusing; Cross polarization; Feed losses; Antenna feed mismatch
The reflected light is too weak to see with the human eye. Out of a pulse of 3×10 17 photons [25] aimed at the reflector, only about 1–5 are received back on Earth, even under good conditions. [26] They can be identified as originating from the laser because the laser is highly monochromatic.