When you observe crossed threads under a microscope, what does this allow you to determine?

• A. The magnification power of the objective lens
• B. The chemical composition of the threads
• C. The order in which the threads are positioned vertically (which thread is on top of the other)
• D. The color absorption spectrum of the threads

Answer: (C)

Verified step by step guidance

1. Understand that when observing crossed threads under a microscope, you are looking at how two threads overlap each other in the field of view.
2. Recognize that the key observation is to determine which thread appears to be on top and which is underneath, based on their relative positions and focus.
3. Note that this observation helps you determine the vertical order or layering of the threads, meaning which thread is positioned above the other in three-dimensional space.
4. Realize that this does not provide information about magnification power, chemical composition, or color absorption spectrum, as those require different methods or observations.
5. Conclude that observing crossed threads under a microscope primarily allows you to determine the order in which the threads are positioned vertically (which thread is on top of the other).