Why is the green laser pointer the brightest?
Among the various colors of the Laser pointer, green will indeed feel very bright, but blue will not feel very dark, but you will feel much softer than green. Why is this happening? This is related to the ratio of red, green and blue cones perceived by the human eye. This is because the sensitivity curve of cone cells (M) that perceive green to light of different wavelengths is mostly coincident with the sensitivity curve of cone cells that perceive red. This means that for 500-565nm green light, not only M Cone cells of type L can be sensed, and cones of L type can also be sensed. Both types of cone cells can perceive green, which is definitely more sensitive than blue cone cells that only have S-type.
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We know that visible light is a form of electromagnetic waves and is the part of the electromagnetic spectrum that the human eye can perceive. For the same energy, the longer the wavelength, the less likely it is to scatter, and the longer it spreads. The wavelength of electromagnetic waves that can be perceived by ordinary human eyes is between 400 and 760 nanometers, and the wavelength of light at different frequencies is also different. The wavelength range of the red laser pointer is 760~622 nm; the wavelength range of yellow light is 597~577 nm; the wavelength range of green laser pointer is 577~492 nm. From the previous sensitivity curve analysis, we know that both M-type cones and L-type cones are sensitive to green, so when we look at green, both M-type and L-type cones will be activated. The M-type cone itself has the largest number, and when we look at blue, only 2% of the cones are activated at most. The signal generated by the retina when a natural person sees green is much stronger than blue. So when you look at blue, you always feel very soft, but green feels very bright.
2021-09-27 12:23:57
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