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Q: Measurement thru a microscope ( Answered ,   0 Comments )
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 Subject: Measurement thru a microscope Category: Science > Biology Asked by: whitbyoz-ga List Price: \$15.00 Posted: 20 Oct 2004 03:10 PDT Expires: 19 Nov 2004 02:10 PST Question ID: 417439
 ```Looking thru a microscope if there are x number of an an object seen how do I calculate how many there would be per sq.cm. if the magnification was 400 and the diameter 490 ? (The x nos. are 16 and 31)```
 ```Hello whitbyoz, here is how I would solve your problem: First convert the 490 micrometers into centimeters. To do this you multiply micrometers by 1 x 10^-4 or 490 micrometers equals .049 centimeters. This is the diameter of your field of view. Next calculate the area of your field of view using: Area = pi d^2 / 4 Area = 3.1416 (.049)^2 / 4 = .0018857 cm^2 Then your formula becomes: Number per sq.cm. = X / .0018857 For X = 16 Number per sq.cm = 16 / .0018857 = 8,485 For X = 31 Number per sq.cm = 31 / .0018857 = 16,439 If there is any of this you don't understand, please ask and I will try and help.```
 whitbyoz-ga rated this answer: `Easy to follow and an answer that made sense. Many Thanks`