Final answer:
The field of view changes by one-tenth when increasing magnification from 100x to 1000x, as the view becomes more detailed and smaller in area.
Step-by-step explanation:
When changing from a low power magnification of 100x to a high power of 1000x, the field of view decreases proportionally with the increase in magnification. The field of view at 1000x will be one-tenth the size of the field of view at 100x since the area seen through the microscope becomes smaller as the magnification increases. This change in field of view is due to the fact that a higher magnification lens has a shorter focal length and thus a smaller diameter, which allows you to see a smaller area in greater detail.