why is it important to locate an object first under low power and then,if desired, change to high power?

Answer 1

After going to school for zoology and taking many biological courses, the reason is because you want to be able to find it under low magnification. As you increase the magnification, you're looking at more detailed structures. For example, if you're looking at a chloroplast on a leaf, you want to find it first before you start looking at it. Otherwise, you may be looking at absolutely nothing on the slide, or nothing of interest.

Answer 2

If you start under high power you can get lost on the slide. Starting at low power helps you narrow the area of the search down.

Answer 3

The main reason is for u to focus on what u want to see first. with a lower power magnification it would be easier to scan through ur sample, to which point u want to look more detailed.. anyway it would be much easier to focus on a lower powered magnification compared to a higher one... after u are comfortable with the focus, and the area u are looking at, then u change to the next higher magnification.. microscopes these days are designed to stay focussed when changing magnification.. so u dont have to meddle too much with the knobs. (usually only a tweak of fine tunning is needed).
another reason is that, with higher power, the lens is much much closer to your sample, there is a risk of u breaking ur glass slide, if u unsuspectingly move ur lens to near...

Answer 4

I'm assuming that you're referring to microscopes here. If you look at something under high power, everything is ultra-magnified and mostly likely you have no idea which part of the specimen you're looking at. You need to locate the area you want to focus on first, and then "zoom in" and look at it in more detail.

Answer 5

you need to constantly discover your subject under low capability first by way of fact there's a 'greater desirable' view and greater area which will nicely be mentioned. in case you have been to objective to discover an endemic in a urine pattern, enable's say, how annoying might it incredibly is to discover a single organism in that numerous a pattern? Very annoying, i might think of. and regardless of in case you progression the slide slowly, it relatively is incredibly annoying to discover the object by way of fact it strikes plenty swifter in severe capability than in low capability. i'm hoping this solutions your question!

Answer 6

Because you'll be looking around forever if you are searching for something 1 micron at a time. Better to look at the whole thing, center it, then go down to maybe 1 mm^2 area, then center it, ect.

Answer 7

Ever tried to look for a coin on the floor in the dark with a flashlight - it is easier in the daylight

Answer 8

So you don't crash the lens into the slide.