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light
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength means a frequency range of roughly 430–750 terahertz (THz).
The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey.
The primary properties of visible light are intensity, propagation direction, frequency or wavelength spectrum, and polarisation, while its speed in a vacuum, 299,792,458 metres per second, is one of the fundamental constants of nature. Visible light, as with all types of electromagnetic radiation (EMR), is experimentally found to always move at this speed in a vacuum.
In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.
^ CIE (1987). International Lighting Vocabulary. Number 17.4. CIE, 4th edition. ISBN 978-3-900734-07-7.
By the International Lighting Vocabulary, the definition of light is: "Any radiation capable of causing a visual sensation directly."
^ Pal, G. K.; Pal, Pravati (2001). "chapter 52". Textbook of Practical Physiology (1st ed.). Chennai: Orient Blackswan. p. 387. ISBN 978-81-250-2021-9. Retrieved 11 October 2013. The human eye has the ability to respond to all the wavelengths of light from 400–700 nm. This is called the visible part of the spectrum.
^ Buser, Pierre A.; Imbert, Michel (1992). Vision. MIT Press. p. 50. ISBN 978-0-262-02336-8. Retrieved 11 October 2013. Light is a special class of radiant energy embracing wavelengths between 400 and 700 nm (or mμ), or 4000 to 7000 Å.
^ Gregory Hallock Smith (2006). Camera lenses: from box camera to digital. SPIE Press. p. 4. ISBN 978-0-8194-6093-6.
^ Narinder Kumar (2008). Comprehensive Physics XII. Laxmi Publications. p. 1416. ISBN 978-81-7008-592-8.
Hello,
This rifle is a Kimber model 84L Mountain Ascent in 280 Ackley Improved with a Zeiss Tera 3X 4-12X42 Scope.
It features skeletonized bolt handle, fluted bolt and barrel for weight savings.
The gun and scope together weighs 6.36 pounds and is an excellent high country rifle.
Included is...
I have a super clean TLR-1 Weapon mounted light. It’s in great shape hardly used. It is not the HL version. I believe it’s the 300 lumen version. Was mounted on a Glock.
$50 firm. Buyer comes to McMinnville to pick up. Will not ship hold or deliver. Please don’t ask.
PRIVATE MESSAGE IF...
Recently picked one up, but haven’t been able to confirm what sights /lights are compatible with this model? Would love to have an hd front or tritium sights for this. Anyone with multiple caniks tried changing them with other models? I’ve seen people mount the olight mini to it, but I’d rather...
I have a tikka t3 in 270 Winchester I’m looking to get rid of or trade for something new. Had it for awhile and just never did much with it. Asking 675 obo or 750 with 100+ rounds.
Bought this new and never used it. Fits my Glock 19 securely and like a glove.
It's compatible with a laser and/or light.
Sells new on Amazon for $40 currently: https://www.amazon.com/gp/product/B00I3FN3B2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Not interested in trades.
Thanks for looking
This rifle looks to be in good shape overall. There are some scratches in the composite stock from use but nothing drastic. The fluted barrel is quite nice and the scope, although just one designed for an air rifle, is still nice and clear.
I got this rifle in a trade with some others and have...
Was planning on mounting to carry gun but sold the gun. In excellent condition. Comes with factory packaging, all rail keys, papers etc.
$170 picked up from Portland/Troutdale.
-R
Less than 300 rounds through the pipe. Will come with OEM range bag, 2 mags, grips, and optics plates.
Mags will not be included if ban state
$1000 without X-300B, $1200 with X-300B
Found this portable light that would be great for camping/ hunting/fishing/ working.
It has a rechargeable battery life of 4 to 9 hours depending on use.
It can be setup as a tablet top or standing lamp.
The lights are also rotatable and the unit comes water resistant rating as well.
Light...
Lightly used
HK P30 Sk light LEM
7 magazines included 5 of which are brand new oem.
Original box with backstrap and all
$580 buyers pays transfer fee and background check. This gun is great I am just more of a full sized carry kinda guy so I’m letting this one go. Basically all the mags are...
Safariland Model 7377-7TS ALS Right Hand Belt Holster for a Glock 19. This holster allows for enclosing a Glock 19 that is fitted with a tactical light. The ALS function include a thumb device that when pressed allows for removal of firearm. It is adjustable for a slight forward or straight...
Cleaning out the gear room, getting rid of the following. No trades unless specified
Knives:
-ESEE CL-1 $125 PENDING
-Gerber strong arm tanto SOLD
-Benchmade infidel fixed SOLD
Uppers n such:
-SMOS 12.5” mlok handguard, SMOS 13.7 barrel, spikes adjustable gas block, surefire warcomp (closed...
Staccato XC 9mm: $4,300
Trijicon RMR TYPE 2 RM09 1.0 MOA LED REFLEX SIGHT: $500
SureFire XH30 Weapon Light: $340
Total Value: $5,140
Your Price: $4,100 $4,000 for the entire package including the RMR and weapon light.
Note: Everything is in excellent condition.
Great condition. Couple of dummy marks on the underside front of the battery compartment cover that do not affect function. I mounted this to my house gun where it has thankfully sat unused for several years. Got a new light as a gift so this one needs a new home. Will come with original box...