2017.10.23

light comes from a light source and either enters ours eyes directly or indirectly, after reflecting off something.
colors with short wavelengths bend more than colors with long wavelengths.this explains why red light bends less than yellow light.the reason is because its wavelength is longer. of the visible colors, violet light has the shortest wavelength, so it bends the most.
a prism separates light into (its component colors) different colors because each color has a different wavelength.
besides the sun, any object that produces its own light is a direct light source.
this clearly demonstrated that/ this explains why
if you have ever painted, you know that different colors can be combined to create new colors.／light is composed of many different colors
mixing three primary colors create a tertiary(三级) color such as brown or gray./secondery
in china red is associated with fire, energy and good fortune.
some colors have even been associated with changes in blood pressure.
colors are wonderful to look at, but they affect people in ways besides sight. they have a powerful effect on how people feel and behave.

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老舍说：“秋天一定要住在北平，北平的秋天没有一样不令你满意的”

北京的秋天