Compute total magnification of a compound microscope from objective and eyepiece.
由物镜/目镜焦距、光学筒长与明视距离,按 M = (L/f₀)(D/fₑ) 计算总放大率。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Total magnification | M = objective × eyepiece (e.g. 40× × 10× = 400×) | Basic microscope optics |
| Useful range | Useful magnification ≈500NA–1000NA; beyond is empty magnification | Standard microscopy guidance |
| NA linkage | NA sets resolution d = 0.61λ ÷ NA first; magnification only enlarges it | Abbe imaging theory |
| Objective markings | Engravings 160/0.17 or ∞ give tube length and cover-glass thickness | International objective marking practice |