Re: BECAUSE the sky reflect the colour of sea -- Physics Discussion Zone

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Date Posted: 01:40:22 03/29/00 Wed
Author: ABC
Subject: Re: BECAUSE the sky reflect the colour of sea
In reply to: ^_^ohayou 's message, "BECAUSE the sky reflect the colour of sea" on 11:01:04 08/16/99 Mon

> Why do the sky look blue ?

There is diffraction (繞射) of the white light in the atomosphere.
因為太陽的白光經過大氣層會有繞射.

At daytime, the sky is blue
===========================
The diffraction for blue light is the strongest.
Thus, during daytime, the sky is blue.
藍光的繞射程度最大, 所以日間的天空是藍色的.

During sunset, the sky is red
=============================
The extent of diffraction drops from blue light
to red light.
During sunset, the light passes through a relatively
longer path in the atmosphere until a large proportion
of red light diffract.
Thus, during sunset, the sky is red.
從藍光到紅光, 繞射程度下降.
日落的時候, 日光通過比較日間更長的大氣層才繞射.
所以, 日落時的天空是紅色的.

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