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Your retina contains three types of colour-sensitive
light-detecting
cells (cone cells). Each of these three types of cone cell has a range of frequencies over which it can detect light. If light hitting the retina is only within the frequency range of one type of cone cell, it will be interpreted by the brain as whichever primary colour (red, green or blue) that particular type of cone cell is responsible for detecting. In the case of an 808nm laser, the frequency of the light produced by it is only detected by one type of cone cell in the retina. Nerve impulses from this type of cone are interpreted by the brain as the colour red.
This might beg the question of how the eye sees colours which are not primary colours. The way in which this happens is that the frequency response ranges of the three types of cone cells actually overlap each other [See related links below]. Light with a frequency within the response ranges of more than one type of cone cell will be detected by both types of cell. The brain then compares the relative amounts of response from each of these types of cells and interprets this as a particular non-primary
colour. An upshot of this is that, by sending the right ratio of red green and blue light, we can produce the same amounts of response in each type of cone cell as a particular non-primary
colour frequency of light would produce, 'tricking' the brain into thinking that it's actually seeing that frequency of light. This is how the display on your computer screen (RGB display) is able to produce different colours with only red green and blue. When you look at something on the screen which is, for example, orange, you aren't actually seeing orange light, but a mixture of red green and blue light.
Aside:
808nm wavelength light is actually outside the frequency response of all of the cone cells in your retina. The only reason you can see it is because the laser diode is not perfectly monochromatic; a range of frequencies are produced, with the higher frequencies just inside the frequency response of red-detecting
cone cells in your retina
.
What else can I help you with?
What is the Ruby laser wavelength?
A ruby laser is a red laser with a wavelength between 694 nm and 628 nm. 1 nanometer = 1×10−9 meter.
Is a 630-680 nm red laser powerful?
Yes
What is the frequency of a red laser beam with a wavelength of 650 nm?
The frequency of a red laser beam with a wavelength of 650 nm can be calculated using the formula: frequency = speed of light / wavelength. The speed of light in a vacuum is approximately 3 x 10^8 m/s. Thus, the frequency of the red laser beam would be approximately 4.6 x 10^14 Hz.
What does nm mean on a laser pointer?
nm is nano-meters. There will be a number preceding the nm. This number indicates how many nano-meters for a full wave length of the laser light.
Meaning of laser mn?
nm means nanometer, that being the wavelength of that laser.
The light from a red laser pointer has a wavelength of about 600 nm If this laser has a power of 0.23 mW what is the momentum carried by a 4.9s pulse of this radiation?
Who cares so long as it toasts yer bagel
What does nm stands for in laser?
Nm stands for nanometer, a very tiny measurement which is used to describe the wavelength of LASERs.
What does 532 wavelength mean in laser?
A laser with a 532 nm wavelength refers to a green laser beam. The number 532 nm indicates the specific wavelength of light that the laser emits, measured in nanometers. This wavelength is in the visible spectrum of light and is commonly used in applications such as laser pointers, laser light shows, and scientific research.
The wavelength of red light from 760nm in meters?
If a wavelength of light emitted from a particular red diode laser is 651 nm, its wavelength would be equivalent to 0.000000651 meters.
If you buy a laser pointer with 532 nm what does nm mean?
nm is nano-meters. There will be a number preceding the nm. This number indicates how many nano-meters for a full wave length of the laser light. A 532nm is one of the more dangerous levels it can blind a person in a very short amount of time.
Where is the Offcenter in Albuquerque New Mexico located?
The address of the Offcenter is: 808 Park Ave SW, Albuquerque, NM 87102-3017
What is the wavelength in nm of red light?
Red light typically has a wavelength of around 620-750 nm.
