Question: Why image a is not as sharp as image d while both images are in focus? When you tried to further focus the image a

  1. Why image a is not as sharp as image d while both images are in focus?
  2. When you tried to further focus the image a to make it sharper, you noticed that the image appears as b and c alternatively as you adjust the focus knob from one direction to the other. What is the technical term for this phenomenon in images b and c? What is the cause of this phenomenon?
  3. To achieve a sharp image like d what SEM alignments you must do?

 Why image a is not as sharp as image d while

(3) To achieve a sharp image like d what SEM alignments you must do? ISSN 03 ROWN 2:11 1927 212 HA

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