1. A scientist will first focus on a specimen using the low-power objective lens, and then move to a higher magnification. Explain why?
A scientist will first focus on a specimen using the low-power objective lens before moving to a higher magnification for a few reasons:
1. The low-power objective lens provides a wider field of view: The low-power objective lens has a lower magnification, which allows the scientist to observe a larger area of the specimen. This is useful when the scientist wants to get an overall view of the specimen or locate specific structures of interest.
2. It helps in locating and identifying regions of interest: By starting with a low magnification, the scientist can easily locate specific regions or structures within the specimen that they want to examine more closely. This initial observation allows them to identify areas where more detailed study is required.
3. It aids in adjusting the focus and centering the specimen: By starting with a lower magnification, it becomes easier to initially focus on the specimen. The larger field of view allows the scientist to adjust the focus and center the specimen more accurately before moving to a higher magnification, where the focal depth becomes more critical.
4. The higher magnification provides more detail: Once the scientist has identified the regions of interest and centered the specimen using the low-power objective lens, they can switch to a higher magnification objective lens. This allows them to observe greater detail and visualization of smaller structures or features on the specimen that may not be visible or distinguishable with lower magnification.
Overall, starting with a low-power objective lens allows the scientist to gain a general understanding of the specimen and locate areas of interest, while moving to a higher magnification allows for more detailed observation and analysis of specific structures or features.