 |
| Sign Convention for Spherical Mirrors |
|
| The following sign convention is used for measuring various distances in the ray diagrams of spherical mirrors: |
| |
 All distances are measured from the pole of the mirror. |
| |
|
Distances measured in the direction of the incident ray are positive and the distances measured in the direction opposite to that of the incident rays are negative. |
| |
|
Distances measured above the principal axis are positive and that measured below the principal axis are negative. |
| |
 |
| |
 |
| |
|
| |
 |
| |
