题目内容

You kept me on the straight path, one I think I still walk.

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You were working at the school and I often managed to get sent outside class for something.

Your chiding was gentle, but right to the point.

But you were never too busy to help with a problem, or just give a hand.

波长为480nm的平行光垂直照射到宽为0.40mm的单缝上，单缝后面的凸透镜焦距为60cm，当单缝两边缘点A、B射向P点的两条光线在P点的相位差为π时，P点离中央明纹中心的距离等于（）。