Question

what is the advantage of starting with the 4x objective before moving to the 10x and then the 40x objective?
the field of view is larger.
the field of view is larger, and it is easier to focus.
the field of view is easier to focus.

Explanation:

When using a microscope, the 4X objective (low - power objective) has a larger field of view compared to higher - power objectives like 10X and 40X. A larger field of view makes it easier to locate the specimen. Also, it is generally easier to focus with the 4X objective because the depth of field is greater and the working distance (the distance between the objective lens and the specimen) is larger, which provides more leeway for initial focusing before moving to higher - power objectives where the depth of field is smaller and focusing is more delicate. The first option only mentions the larger field of view, and the third option only mentions easier focusing, but the second option combines both correct aspects.

Answer:

B. The field of view is larger, and it is easier to focus.