the measurements are referring to how much of the scene you can fit in the frame. bigger numbers are for closer shots, smaller numbers will fit more scenery into the frame.
For example, 35mm is great for landscapes, 85 would be good for portraits.
If mm means nothing to you, you might want to take at least a beginning class in photography to get you up to speed. I would have thought that somewhere along the course of you education, the metric measuring system may have been mentioned
mm is the term abbreviation for millimeter, one thousandth of a meter and is a liner dimension.
If those lengths were in reference to a 35 mm camera, the 35 mm would be a moderate wide angle lens, the 50 mm would be a 'normal" lens and the 85 mm a moderate telephoto lens most closely associated with shooting portraits. If the cameras format is medium (120 film or 6 x 6 cm, etc), then the 35 mm lens would be an extreme wide angle, the 50 mm a wide angle and the 85 mm close to a normal lens. So you see, the measurement of a lens in portions of a meter describe the type lens it is if you know the format of the sensor or film it is designed to be used with.
The 50mm sees basically basically the way the eye does. Compare other lens to it (use the 50mm as a reference point). So with that set, the 35mm would be a wider view and the 85mm would provide a view that is more narrow in view and closer.
Below is a quick visual example I came across.
Hope this helps.
Mark
Hey,
I wrote an article on my blog about lenses and also which ones to buy under 1000$.
I explained what's focal lenght (these mm) aperture (those f/2.8 or any similar numbers) and you have to know. Here is the article, I think it will help you - [URL Truncated]
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