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Why are blue lights harder to see?

In fairy lights the blue ones can be harder to resolve: why?
27 April 2017
Presented byIzzie Clarke.
Production byIzzie Clarke.
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大卫想知道为什么他看到的蓝光Christmas trees were often harder to make out. Izzie Clarke spoke to Dr George Dobre from Kent University to shed some light on the issue.

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