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如图1所示,有两片涂敷硫酸金鸡钠碱晶体的塑料片,在下面一片上写“光学”两字,若把这两片塑料片后面放一白光光源,并转动其中一张塑料片,当它们处于某些位置时,我们在两张塑料片的前面可以清晰地看到“光学”两个字。此后,若缓慢地转动其中一张塑料片,“光学”两字逐渐由明变暗;当转到90°角时,“光学”两字最暗;当转过90°时,“光学”两字又逐渐变亮起来了,到θ=180°时最亮。你知道“光学”两字忽明忽暗的原因吗?
As shown in Figure 1, there are two pieces of plastic sheet coated with gold chicken sodium sulfate crystal, write the word “optical” on the lower one, if put a white light source behind the two plastic sheets, and turn one of the plastics When they are in certain positions, we can clearly see the word “optical” in front of two plastic sheets. Afterwards, if one of the plastic pieces is rotated slowly, the word “optics” gradually darkens from the light; when turning to the 90° angle, the word “optical” is the darkest; when it turns 90°, the “optical” two. The word gradually becomes brighter, and is the brightest when θ=180°. Do you know why the word “optical” flickers?