NEET PG DENTAL EXAM

Detailed explanation-1: -The fine-adjustment knob on a light microscope focuses by moving the lens slowly and is used to focus on the specimen more clearly. It is used with the high-power objective lenses. The course-adjustment knob focuses by moving the lens quickly and is used to find the specimen your are observing.

Detailed explanation-2: -At a high power objective, the focus will change rapidly as the objective lens is adjusted, so only the fine focus knob should be used in order to prevent overshooting the correct focal plane.

Detailed explanation-3: -Important Note: Before switching to high power, you should always position the specimen in the center of the field of view and use the fine adjust to sharpen the focus of the image. Never use the coarse adjustment when using high power. Doing so could break the slide or the microscope! 17.