When viewing a specimen, you must always use the lower power objective lenses first. Low power lens gives the widest field of view and makes it easier to find the specimen when you look through the microscope. Finding the specimen at high power, without first centering it in the field of view at low power, is nearly impossible.
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The objective lens used to locate the specimen and the first focus is the low-power objective lens with a magnification typically ranging from 4x to 10x. This lens provides a wider field of view and lower magnification to help locate and focus on the specimen before switching to higher magnifications for more detailed examination.
Whichever objective has the lowest magnification. On many microscopes, it is the 4X or scanning objective.
low power objective lens to locate and focus on the specimen before moving to higher magnifications.
When viewing a specimen under the microscope, you should always start with the lowest magnification objective lens. This allows you to locate and focus on the specimen before moving to higher magnifications for a closer look.
The main parts of a microscope are the eyepiece, objective lens, stage, focus knobs, and light source. The eyepiece is where you look through to see the specimen, the objective lens magnifies the specimen, the stage holds the specimen in place, the focus knobs adjust the focus of the specimen, and the light source illuminates the specimen for better visibility.
To initially locate the specimen, you should use the low-power objective. This objective provides a wider field of view, making it easier to scan the slide and locate the specimen before switching to a higher magnification objective for more detailed observation.
The objective lens of a microscope brings a specimen into focus by adjusting the distance between the lens and the specimen. This is done by turning the focus knob to move the lens up or down, which changes the focal point and sharpens the image.