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tornadozyb

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[求助] 我们老师出了一道题,我们不知道该怎么做,求指导哈~~谢谢

4. Describe, using clear sketches, what you would expect to see in a thin (couple of μm)section of a blown film of linear polyethylene between crossed polarizers under a high magnification optical microscope. Section a is cut parallel to the extrusion direction, while section b is cut perpendicular to it. First draw the slice, indicate the directions of extrusion and of the light beam. Take account of the resolution limit of an optical microscope.

该怎么答阿,求解
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