How to calibrate microscope w/o eyepiece micrometer?
919638
ha ha -- do your own home work next time.
831122
Use the smallest mechanical pipette for the purpose, i.e., if you need to pipette 150 microliters, then use a 200 microliter pipette with tips to match. (I think these are correct scales; it has been awhile since I used the mechanical pipettes). I find a greater accuracy than trying to use a 1 ml pipette to aliquot 50 microliters of solution. I used a multiple mechanical pipette for ELISA plates; however, they often have one or more channel that does not fill properly on the first try. Therefore, I suggest, taking up, releasing and retaking the solution in the pipette until you visually verify the liquid levels in all tips are approximately equal. \n\nOn the whole, I have found that the retaking up of solution (take up aliquot, release, then refill the tip 1-3 times) makes for the most accurate takeup of the proper measured amount on the mechanical pipette.
409033
a vernier caliper should do the trick.  it can measure the inner and outer diameter
271006
http://www.trinerscale.com/press.micro.html
875835
OD=E*d*C\n\nWhere OD=optical density\nE the molar extinction coefficient\nd the length of the path of the light through the solution (width of the cuvette)\nC the concentration in mole/L of the solute.\n\nYou need d and C as well to get E.\nThis is a fair approximation especially for student problems.\n\nIn reality if you wanted to find E, you would do a standard curve by measuring the OD of samples of known concentration.\nThen you would use linear regression to find the equation of the curve and from its slope you would calculate E (slope=E*d)\n\nA good standard curve and thus accurate calculation requires care to ensure the accuracy of the standards, several points (ideally 9 at least) and being within the linear are of the method.\nThe region of highest accuracy is 0.2-0.8. You can go even below or above this range (though not above 1.0) but this is the range where the photometric error is minimal.
853272
Use this online converter\nhttp://www.kt.rim.or.jp/~tyamamot/pt.htm\n\nPut in size then choose unit as mm\nConversion standard is American Standards Association 1933\nNumerical format is "real"\nClick "CALC"\nThen scroll down to "results" & look for the result for the 1/72 inch point system\nCross check: 1pt  (1/72inch point system) = .35277777777777775mm....or 1mm = 2.8346456692913384 pt (1/72 inch point system)
1083225
This is something you learn best through hands-on... but here's a couple of sites to help you. For most simple equipment like magnifying glasses or balance scales, use the package insert for details.\n\nhttp://www.ekcsk12.org/science/lelab/microscopeuselab.htm\n\nhttp://www.mdk12.org/instruction/curriculum/science/safety/safety.html
965276
Newtonian telescopes are especially easy to collimate, since there is only one curved mirror and an eyepiece.  Basically, you need to get the eyepiece centered in the image formed by the mirror, you have to get it pointed in the right direction, and you have to get it focussed.
1114621
The poster just above mine provided the correct reason for why it is used, but they failed to say when.  On many microscopes today, there are 4 different settings; low (red), medium (yellow), high (blue), and oil immersion (usually represented with a white ring).  For the low, medium and high settings, you do not need to use the oil.  However, in order to see clearly on the highest, you would need to use the oil.\n\nIt might be opposite with the red and blue rings, I don't have a microscope in front of me at the moment.
409297
ok here is the thing\nif you are trying to calculate the thickness of a piece of paper you will need some equpment. Even though there is a lot of room for human error you still can get a fair estimate. \n\nwhat you need is 2 extrememly smooth glass plates and a lineat light source say a laser pointer. \n\nput one glass plate on a table place your paper on the side of the glass and put the other glass plate on the top of the two so that you will get a wedge between the two glasses. \n\nnow point the laser pointer perpendicular to the bottom glass plate and place a screen for reflections. you will get multiple reflections. (btw you need to know the frequency of the light emitted from the pointer.)\n\nthis is the set up\nfor calculations do a little search on air wedge interference \n\ni dont think you will need refractive indexes since you are using the same glass\nwith a little algebra you can figure it out
367001
Buy a magnifying glass.
526883
set up a needle that is bent at the end. put it on the ground. then get a giant roll of paper and prop the bent end of the needle on to it. then make a machine that will turn the paper. dip the bent end in ink, and you have a siesmometer
1179743
if you need to see bacterial morphology, it's probably 100x objective (total magnification = 1000x).  This would be under oil immersion.  This is the only magnification i know of that comes standard on a compound microscope that would allow you to see bacterial morphology clearly....anything lower (ie-400x) and you won't be able to see much more than some tiny speckles on a slide.
271622
Leeuwenhoek Microscope, pretty sure this is it. If you want a pic of it and description  visit the site i found on it.
874618
I came up with a magnification of about 16\n\nThis interactive website will calculate what you need ==>http://www.csgnetwork.com/telescopemagcalc.html
1116717
Hi try using this online service. http://www.easyrgb.com/calibrate.php?k0=index.html\nor the software provided by them, http://www.easyrgb.com/easyrgbpc.html\nHope this help.:)
96567
got a dandy.....even though  it  seems  difficult   youll  break through  and  find  out  you can  almost  measure  anything....try  this  because  i dont  know  what  type  of  equipment  you have....in  search  bar  go.....vernier  read .. hit search..the  NTNU site java  is  excellentyou you can  even  practice  measuring  on  line.....reading  a  vernier  is  good too.....check  them  all