Astronomical telescope (relaxed eye) (M = −fo/fe)
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M = −fo/fe
What each symbol means
| Symbol | What it stands for |
|---|---|
| M | Angular magnification (astronomical telescope, relaxed eye) |
| f_e | Focal length of eyepiece (m) |
| f_o | Focal length of objective (m) |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).