The optical system uses the fluorescent lamp with the collimation mirror, incident the grating surface by the parallel light, in order to produce the moiréfringe through the grating.
光学系统采用白光灯加准直镜，以平行光照射光栅面，通过光栅副产生莫尔条纹。
The lamp is reflected in the mirror.
这灯反照在这镜子里。
Pythagoras told his disciples that they should look at themselves in a mirror, not by the light of a lamp, but by the light of the sun.
毕达哥拉斯告诉他的门徒，他们应该从镜中看看自己，不要依靠灯光而要借助阳光。
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