What is the correct method to remove immersion oil from the 100X objective?

What is the correct method to remove immersion oil from the 100X objective?

• A. Wipe with tissue
• B. Dab with lens paper
• C. Use alcohol wipe
• D. Rinse with water

Answer: (B)

Removing immersion oil from the 100X objective requires a gentle, optics-safe blotting approach. Oil on the objective can smear easily and, if left behind, can affect image quality and potentially damage coatings. Lens paper is specifically designed for optical surfaces—it's lint-free and soft—so a light dab absorbs the oil without leaving fibers or scratching the lens. Using ordinary tissue can shed fibers and smear oil, making cleanup worse. An alcohol wipe uses solvents that can harm coatings or leave residues, and may not remove all oil effectively. Water won’t dissolve immersion oil since the oil is hydrophobic, so it would leave a film. So, a careful dab with clean lens paper is the best method.

Removing immersion oil from the 100X objective requires a gentle, optics-safe blotting approach. Oil on the objective can smear easily and, if left behind, can affect image quality and potentially damage coatings. Lens paper is specifically designed for optical surfaces—it's lint-free and soft—so a light dab absorbs the oil without leaving fibers or scratching the lens. Using ordinary tissue can shed fibers and smear oil, making cleanup worse. An alcohol wipe uses solvents that can harm coatings or leave residues, and may not remove all oil effectively. Water won’t dissolve immersion oil since the oil is hydrophobic, so it would leave a film. So, a careful dab with clean lens paper is the best method.