The sun light enters from the left and always travels in a horizontal line in this applet.
The y coordinate of the incident light can be changed by clicking in the area of the upper half of the drop of water and doing a drag.
The angle between the incident light (horizontal axis) and the refracting
light is maximized for a specific entrance point on the drop. Even if the position of the incident light changes in the
neighborhood of this point, the direction of the refracting light
doesn't change too much.
Therefore, the rainbow can be best seen in this direction.
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Copyright(c) 1997 S.Kamikawa last update 1997.4.9