A microscope has a scale of 250:1.

What does this scale mean?

Step-by-step explanation:

This means that without the microscope, your bare eyes can see only 1 unit. But once you use the microscope, you can actually see 250 units. Units depend on the situation.

Answer: A microscope with a scale of 250:1 means that the object looked at will appear to be 250 times bigger.

Step-by-step explanation:

Microscope are magnifying lenses used to view tiny things to make them bigger and more visible. The main function of a microscope is to magnify a tiny object or to magnify the little details of a larger object to examine minute specimens which the naked eye cannot see.

A microscope with a scale of 250:1 means that the object that is looked at will appear to be bigger by 250 times it's normal size.