Final answer:
The proper handling precaution for a microscope is to avoid touching the lenses with your fingers. Always carry the microscope using two hands, and follow the specific maintenance and focusing procedures to ensure care and achieve high-quality imagery.
Step-by-step explanation:
The correct handling precaution for a microscope is c. Avoid touching the lenses with your fingers. Oils and dirt from your fingers can smudge the lenses, affecting the quality of the microscopic images. Instead, when cleaning the lenses, you should use either lens paper or Kimwipes, which are gentle and designed not to scratch the delicate optical surfaces.
Furthermore, when carrying a microscope, always use two hands and grasp the arm and base, never the stage or focusing knobs. After use, ensure that all lenses are cleaned, the microscope is switched off, the cord is wrapped properly, and it is covered with its protective cover.
For maintenance and best outcomes, it is essential to follow the proper procedures, like using the coarse focusing knob for large-scale adjustments with lower magnification objectives (4x and 10x) and the fine focusing knob with higher magnification objectives (40x or 100x), to prevent damage to the microscope and achieve optimal resolution.