Simple microscope (angular magnification near point) (M = 1 + D/fe)
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M = 1 + D/fe
What each symbol means
| Symbol | What it stands for |
|---|---|
| D | Least distance of distinct vision (usually 25 cm) |
| M | Angular magnification (simple microscope, near point) |
| f_e | Focal length of eyepiece / lens (m) |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).