If the label says "UV absorption up to 400 nm" or "Meets ANSI UV Requirements" these are effective.
如果标签上表明“紫外线吸收波长至400nm”或者“达到ANSI紫外线标准”，那么就是有效的。
For example, if pure white light hits an apple, all colors (wavelengths of light) are absorbed except for red (700-630 nm).
举例来说，纯粹的白光照射苹果，除红色外(波长700- 630纳米)所有的颜色(所有波长)的光都会被吸收。
For example, if pure white light hits an apple, all colors (wavelengths of light) are absorbed except for red (700-630 nm).
举例来说，纯粹的白光照射苹果，除红色外(波长700- 630纳米)所有的颜色(所有波长)的光都会被吸收。
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