I do not understand what visible and sharp focus mean.
The instruction says....
When viewing the crossed hairs and the top hair is in sharp focus, is the other hair visible or in sharp focus at the following total magnification...?
To understand the terms "visible" and "sharp focus" in the context of your instruction, let me explain what they mean.
1. Visible: In this context, "visible" refers to whether the other hair (not the top hair) can be seen or observed. It is asking if the other hair is apparent or clearly distinguishable when observed through the lens.
2. Sharp focus: "Sharp focus" means that the top hair is in clear and precise focus. It indicates that the image is sharply defined and well-defined, without being blurry or out of focus.
Now, to answer the question provided in the instruction, you need to consider whether the other hair is visible or in sharp focus. To do so, follow these steps:
1. Look through the lens at the crossed hairs.
2. Focus on the top hair until it appears in sharp focus.
3. Observe the other hair and determine whether it is visible or if it also appears in sharp focus.
4. Consider the total magnification provided in the instruction (which is not explicitly stated in your question) and base your answer on that specific magnification.
By going through these steps, you will be able to determine whether the other hair is visible or in sharp focus at the given total magnification as mentioned in the instruction.