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Physics

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  • $\begingroup$ But ,in noon also this means some of the sunlight is reflected back ....but we don't notice it , simply we see a green color leaf. But as in morning or sunset when light is reddish yellow , we start seeing a golden patch. So why don't in noon we see white patches ? And only green color of leaf? $\endgroup$
    – user313211
    Commented Oct 11, 2021 at 8:54
  • $\begingroup$ @SureshChandraPal that's because of chromatic adaptation. $\endgroup$
    – Ruslan
    Commented Oct 11, 2021 at 9:06
  • $\begingroup$ What do u mean ,can u pls explainsir? $\endgroup$
    – user313211
    Commented Oct 11, 2021 at 9:18
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    $\begingroup$ @SureshChandraPal you should make a clear distinction between color and frequency. The color of an object is composed of a lot of frequencies in different proportions. A green object will have more reflectance in the green range of the spectrum, but may have nonzero reflectance in other parts of the spectrum. In particular, if you look through a red filter at a leave lying on a wet soil, you'll see that the leave is brighter than the soil. This must mean that some red is reflected from the leave, so not all of it is absorbed. $\endgroup$
    – Ruslan
    Commented Oct 11, 2021 at 10:59
  • 1
    $\begingroup$ @SureshChandraPal that's basically right. In the evening sunlight has much smaller amount of blue, and somewhat smaller amount of green, so you get a noticeable tint of orange in the reflected light. I.e. if at noon you get "small blue, large green, small red", then in the evening the reflected light is "almost no blue, some green, some red", and this looks like orange. $\endgroup$
    – Ruslan
    Commented Oct 11, 2021 at 11:37