2 Answers

  1. Not exactly.�

    And not just grass.

    There may be a whole treatise on this topic, but I will restrain myself, and I will be happy to answer in the comments if they ask me to expand on any suggestion.

    How do we see it? Light from the sun hits an object (in our case, grass) and is reflected from it and gets to our eyes. Then the signal goes to the brain, and it recognizes that it is grass, and it is green.
    The color is determined by the frequency of the light wave, but you don't have to worry too much about it.

    The problem can arise at any stage of our perception.

    1. If we are in a garden where the lanterns do not shine white, but pink, then the grass will seem pink to us. And it will be true: light determines color.

    2. If we wear rose-colored glasses, the light reflected by the grass will not fall directly into our eyes, but will first pass through the glass, and the grass will turn pink again. And it will be true.

    3. Our eye's receptors may not work properly and will see the grass as pink. This happens in colorblind people, they will see the grass yellow or blue. And it will be true.
      It is interesting that color blindness was only discovered at the end of the 18th century: it was so unimportant to everyone how you see the grass.

    4. The brain can process information incorrectly, and the grass can be pink again for such a person.

    5. If someone picks up a piece of grass and starts running away from you at high speed, you will see the grass red. And if the person will run to you, then purple. And it will all be true. This phenomenon is called the Doppler effect in physics. However, the person with the grass in their hand will still see it as green. And he will also be right!

    The color of grass depends on our perception, and it is not the same for everyone. The perception of most people who are not colorblind and do not run with grass in their hand at high speeds is accepted as the truth.

  2. Not all of it, of course, but mostly yes. All thanks to the composition: chlorophyll.�

    You can read a little about it here.�

    I also found this:

    Chlorophylls are activated not by energy, but by photons. That is, the more photons there are, the more active the photosynthetic reaction is. The number of photons, on the contrary, increases with increasing wavelength.

    As a result, it is much more profitable for chlorophyll to absorb red and blue colors than colors in the middle of the spectrum, which give the plant too little energy. Therefore, chlorophylls reflect it. And we perceive the reflected color as green.

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