在处理反射时安全性是一个较复杂的问题。
Security can be a complex issue when dealing with reflection.
在阳光在雨水两次反射时，就可能发生双层彩虹。
Double rainbows occur when the sunlight is reflected twice inside the raindrops.
但是两者都需要真正理解光线在透过镜头和从镜子里反射时发生了什么。
But both will have a solid understanding of what happens to light as it travels through the lenses and bounces off the mirrors.
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