When using a light microscope, if you want the field of view to be larger, you would use?
970064
if you want the field of view to be larger use the LPO (Low power objective) and if you want the specimen appears bigger use the HPO  (High Power Objective)
1105433
You could, but it would be huge overkill. The telescope's objective (lens or mirror) limits the resolution of the image in the focal plane. So you'd be using a microscope to examine (at huge magnification) that resolution-limited image. You'd see nothing but a lot of fuzz, even when in focus; and it would be dim fuzz at that, because you'd only be capturing a tiny fraction of the available light.\n\nI'd stick to standard eyepieces.
606323
Accordigng to my biology book, a normal microscope has a highest magnification of 430x, a compound microscope can do 1800x, and an electron microscope can do over 100,000x.
744055
I tried multi focal and they are really difficult to get used to.  I went back to mono, its easier  to change spectacles than keep moving your head around to keep the image focused in the "sweet spot" in the multis....:D
320305
The other mathematical formula to remember (the last one, I promise) is the one that tells you the twilight factor of your instrument, i.e.; how much light will be transmitted to your eye. This is found by multiplying the magnification by the size of objective and taking the square root of the result. Again, using the 7x50 as an example, i.e. Ö7x50 = 18.71 twilight factor. The larger the result the better the theoretical light transmission with 15 being good and 25 being excellent. I say theoretical because if you were to compare two optical instruments of like size, the more expensive one would give you a better image due to the quality of glass and internal finish.\n\nAs in all things there are provisos however. The optical advantages between one or other of the top manufacturers are tiny and can be measured by a very few minutes’ difference at last light, and really the choice boils down to which instrument catches your eye or sports the niftiest badge. Secondly, the superior optical performance of an expensive instrument can be degraded by a single scratch. Yes! One scratch on the front lens will degrade the image in your £600 glass to that of a £250 one.
1046710
1. make sure the specimen is actually under your field of view. then, keep adjusting the focus knobs gently until it comes into focus. also, you might want to restain your specimen.
419158
Same as in a camera or telescope, the zone of acceptable sharpness is referred to as the depth of field.  Read more at the source isted below.
875983
It's what you peer into. There's a diagram here:\n\nhttp://en.wikipedia.org/wiki/Optical_microscope
510163
microscopes work well
940202
You should be able to observe human sperm with any magnification above 100X. Although to get any detail you would need around 300X.
338178
http://inventors.about.com/od/mstartinventions/a/microscope.htm
477266
It's easier to draw than to explain. But the size of the object you are looking at depends on the angle of the light from the top and the bottom of the object as it enters your eye.. The bigger the angle, the bigger it appears to you. \nSo.. a 20 metre high tree looks quite big 100 metres away, but a kilometer away it looks much smaller. The tree is the same height but the angle of the light from the top and the bottom is a lot smaller.
949345
It's all about refraction ( a fancy term which means bending light)... The lenses in the microscope bend the light before it enters your eye so that it looks as though it comes from a much bigger object. Draw a horizontal line and put a dot on the left of the line to indicate your eye. On the right of the line put a vertical stick (so its base is on the line).  Now join the top of the line to your eye. That's a light ray entering your eye from the top of the stick. Now make the stick much bigger. and do the same thing. Notice that as the stick gets bigger the angle between the horizontal line and the light ray from the top of the stick and your eye gets bigger too. If you can change the angle as light enters your eye things will look biger. That's what the lens does.
442077
You need a parabolic 5-inch reflector which you can get from headlight (but not a sealed beam) or a large flashlight. Or you can use a 5-inch convex lens like the ones used for close-up work (try a hobby shop). You will also need a very small source of light. A flashlight bulb should do. The light source should be positioned at the focal point of the reflector or lens. Since the lens/reflector will not be perfect and the light source will not be a true point, the beam will not be perfectly parallel.\nThe sun IS a near-perfect parallel light source in the context of a 5-inch viewing field. Maybe that's what you meant. I can't see it being used by your construction.
315325
An upright microscope looks down at the stage, slide and specimen, and transmitted light travels upward from a mirror located below the stage. An inverted microscope does the opposite. Its optics include a prism so that a person looking down into the microscope sees the view from below the stage. An advantage of the inverted microscope is said to be the ability to view live specimens in a deep covered container (see ref.). The short working distance of the typical objective lens prevents such viewing in the upright microscope. (However some change in the inverted microscope's objective is needed to accommodate container thickness.)
761501
If nothing else,you can use this but I am not positive.  "A telescope can refract images."
911380
because the angle at which the light refracts is too large.