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Apr 30, 2017 · The pupils of the eye might have a 2mm diameter in bright light, so receive around $6.2\times 10^{-9}$ W. Let's assume that the average blue sky photon is at 400 nm with an energy of 3.1 eV, then you receive about $10^{10}$ per second (in each eye).
Mar 7, 2017 · So, obviously, if you were to detect the photon you couldn’t, by definition, then expose your eye to it? You’ve got to sort of try and work out some way of saying well you know roughly how many photons must be arriving in the eye to trigger a response in the retina?
White light is dispersed by a glass prism into the colors of the visible spectrum. The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light (or simply light).
Visible light - that which is detectable by the human eye - consists of wavelengths ranging from approximately 780 nanometer (7.80 x 10 -7 m) down to 390 nanometer (3.90 x 10 -7 m). Specific wavelengths within the spectrum correspond to a specific color based upon how humans typically perceive light of that wavelength.
- Visible Spectrum
- Wavelength
- Frequency
- Speed of Light
- Light Can Travel Slower
- Wavelength and Frequency Are Linked
- Light Travels in Straight Lines
- Wave
- Photons
- Polarization
Visible Light: the wavelengths that are visible to most human eyes. The main colors, in order, go "Roy G Bv": Red Orange Yellow Green Blue Violet As we see on this beautiful rainbow:
Light has a wavelengthof about 380 nm to 750 nm, depending on color. Definitions vary, but here is a rough guide:
The frequencyof red light is about 400 THz (and for violet is about 800 THz) Higher frequency (with shorter wavelength) has more energy: 1. Red light has lower frequency, longer wavelength and less energy 2. Blue light has higher frequency, shorter wavelength and more energy
Light travels at almost 300,000,000 meters per second(to be exact: 299,792,458 meters per second) in a vacuum. That is 300 million metersevery second, or: 1. 3 × 108m/s 2. 300,000 km/s 3. 186,000 miles per second At that speed light travels: It is so fast, but still takes about 8 minutes from the surface of the Sun to the Earth. The symbol for this...
We really shouldn't call it the speed of light, firstly because it applies to the whole electromagnetic spectrum, and gravity waves, and more. Maybe we could call it "Max Speed"! But also because light only travels that speed in a vacuum! It can travel slower ...
The Wavelength and Frequency are related: Frequency = Velocity Wavelength Wavelength = Velocity Frequency Assuming the light is in a vacuum, the velocity is the speed of light: 3 × 108m/s Let's try a simple example (in this case nota wavelength of light):
Light travels in a straight lineuntil its hits something, or it's path is changed by different densities, or by gravity. Light from the Sun streams across the road. The shadows also show that light travels in straight lines. This light spreads out a little and is scattered by the atmosphere. Laser beams making straight lines.
Light behaves as a wave, so it can: 1. reflect(bounce off), 2. scatter (bounce off in all directions), 3. refract(change speed and direction) 4. diffract(spread out past an opening) 5. transmit (pass straight through) 6. or get absorbed
Light also behaves as packets of energy called Photons. 1. We can measure a photon's position and momentum. 2. Photons have no mass, but each photon has an amount of energy based on its frequency (number of vibrations per second) 3. Each photon has a wavelength So it is like a particle and also like a wave. This is called the "wave-particle duality...
Light is normally free to vibrate in any direction at right angles to its path. But polarizedlight vibrates in one plane only: Light gets partly polarized when it bounces off surfaces like water or glass. Polarizing lensescan block light from that plane, to cut down on reflected light and make it easier to see into water: Without and witha polarizi...
Jun 7, 2024 · The human eye sees color wavelengths ranging roughly from 400 nanometers (violet) to 700 nanometers (red). Light from 400–700 nanometers (nm) is called visible light or the visible spectrum, because humans can see it.
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Jan 9, 2020 · Visible light is a range of electromagnetic radiation that can be detected by the human eye. The wavelengths associated with this range are 380 to 750 nanometers (nm) while the frequency range is approximately 430 to 750 terahertz (THz).
