how do you calculate how long a organism is under a microscope?

Question

okk. so for biology, we had to look at this organism...mine was a spirogyra and we had to find out/calculate the size. and like, i dont know how to do that. =(
like...this is what we have.
the lowest objective (red) is 40x>10 units=.25 mm
the middle objective (blue) is 100x>10 units=.1 mm
the highest objective (yellow) is 400x>10 units=.025 mm
i did mine on the middle objective one..the blue one..
so please help me out.
=)

Answer 1

Based on the lens size, which I am assuming is the x value under the multiple of ten units per hundred thousanth would be equivalent to the value. You picked the middle, (blue) the equivalent to the equation is .1mm. You need to find the figure out the size of the (factor) spirogyra in it units. Part of your equation is missing. Units (factor) multiplied by the value would equal the size of the spirogyra.

Answer 2

think about it.

the units you speak of must represent a standard measurement printed on the slides.

So at the middle objective (100x) 1 unit is .01 mm right.

so how many units long is it under the scope?

if 40 then one unit is .025 mm

if 400 then one unit is .0025. right?

multiply the number of units under the scope times the respective lenght for one unit

Answer 3

u have to see how many of the spirogyra would fit across the field of view, then, divide the length of the field of view by that number.

for example, if you could fit two spirogyra across the field of view at 100x. then divide .1mm by 2

Answer 4

It sounds like they want you to go from mm to microns. Estimate how many millimeters long the organism is and then do the conversion to microns.

Answer 5

The best you could do is estimate.