Force of laser on mirror

Laser Ranging Retro-Reflector - Wikipedia, the free encyclopedia
Printed photonic crystal mirrors shrink on-chip lasers | KurzweilAI

Laser Ranging Retro-Reflector. Also called LR-3, is an experiment installed on the ALSEP three of the Apollo missions (Apollo 11, 14 and 15), but not part of it, intended to reflect a beam of laser fired from our planet, in order to measure with high accuracy the distance that at a given moment is the Moon .

This experiment has been used for over 35 years and is still active. The reflector of Apollo 15 is three times larger than the other two reflectors previous missions, so this reflector was the target of 75% of the measurements made ​​in the first 25 years of the experiment. The improvement in technology since then has resulted in increased use of the first two reflectors, from different observatories in the world, as the McDonald Observatory ( United States ) and the Côte d'Azur Observatory ( France ).

Some results of this experiment are:

  • The orbit of the Moon is moving away from Earth at a rate of 3.8 centimeters per year, due to the tidal land.
  • The moon probably has a liquid core.
  • It has limited the measurement error of Newton's gravitational constant, so that the force of gravity is very stable.
  • The orbit of the moon as far with reflectors is within the limits predicted by the theory of relativity of Einstein .

The two rovers Soviet program automatic Lunokhod Moon also led to similar small mirrors. Were received laser signals bounced off the Lunokhod 1, but contact was lost since 1971, due to the final orientation of the reflector and uncertainty about its location on the Moon. In April 2010, an observatory of the University of California at San Diego, used the images of the Lunar Reconnaissance Orbiter to locate. The April 22, 2010 and subsequent days measured the distance the rover, with success, reaching to within 1 meter. To their surprise, the Lunokhod 1 reflector are reflecting much more light than any of the other reflectors on the Moon. Meanwhile, the retro-reflector of Lunokhod 2 continues bouncing laser signals sent from Earth.

The undeniable presence of laser retroreflectors on the lunar surface has been used as an argument to refute the claims that the Apollo moon landings were fake .


APP PHYSICS Physics: Magnetism
Mobile Application (APP PHYSICS)
  • Learn the essentials of magnetism
  • Review forces, fields, currents, and more for tomorrow's test
  • Educate yourself and success will follow

You might also like:

TEMPTATIONS TV Commercial: Boots (30 sec)
TEMPTATIONS TV Commercial: Boots (30 sec)

LIGO uses the mass of photons for calibraiton

2007-06-02 13:51:42 by Random_Engineer

Photons do have mass, at least to the extent that they are affected by gravity and can impart force on objects they interact with.
The LIGO (Laser Interferometry Gravitational-Wave Observatory; has an insanely sensitive interferometer that can detected the slightest of forces acting on the mirrors. My understanding is that to test the instrument, they bounce one or more laser pulses off the mirrors they normally use to detect gravity waves. In other words, they use photons as their mechanical excitation force to perturb a mirror - kind of like bouncing a billiard ball off the bumper on a pool table

Paranoia, reviewed: Middle-of-your-seat thriller will only have you worried ..  — National Post
So far, not much paranoia, although director Robert Luketic (Legally Blond, The Ugly Truth) tries his best to establish some atmosphere by inserting shots of hovering helicopters, whirring security cameras, fisheye mirrors and, for no apparent reason ..

The Akron Art Museum's "Real/Surreal" show is a trip to the Twilight Zone  — Plain Dealer
The problem is that the towers have no windows and entrances, and the street appears to be peeling into bony fragments no vehicle could traverse. It's a bad dream from which there is no escape. The same is true of ..

LucasArts Star Wars the Clone Wars: Light Sabre Duels
Video Games (LucasArts)
  • Star Wars The Clone Wars: Lightsaber Duels brings the fun and excitement of lightsaber battle to your living room
  • Immersive gameplay with characters, locations, and epic duels from the Star Wars animated feature film and television series
  • Choose from your favorite heroes and villains, such as Anakin Skywalker, Ahsoka Tano, General Grievous or Asajj Ventress
  • Exploit your interactive surrounds to defeat your opponent, slice down pillars and use the Force to toss them at your foes
  • Each character, villain or hero, comes equipped with a unique fight style and set of skills
IkROSS iKross Solar/USB Powered Wireless Bluetooth Speaker Phone Handsfree Car kit for iPhone, Blackberry, LG, HTC, Samsung, Pantech, Huawei, Motorola, ZTE, Tablet, Cell Phone, Smartphone, Prepaid phone, unlocked Phone, Mobile Phone, and More
Wireless (IkROSS)
  • iKross IKBT16 Solar Powered Bluetooth Wireless Car Kit
  • MultiPoint feature: connect 2 cellphones at the same time
  • Recharge battery either by charging cable or direct sunlight
  • Echo cancellation and noise suppression
Logitech Logitech MX 518 High Performance Optical Gaming Mouse (Metal)
CE (Logitech)
  • Bulk/Retail - Retail
  • Connectivity - USB
  • Color - Black / Silver
  • Button Count - N/A

Related posts:

  1. Mirror Lessons for Kids
  2. Etched Decals for Mirrors
  3. J Track for Mirrors
  4. Floor Mirrors UK
  5. Narrow Floor Mirrors