Sign Conventions
Sign Conventions
Sign Convention:
With spherical mirrors, we generally come across four distances parallel to and two distances perpendicular to the principal axis. Each of these six distances has a particular mathematical quantity associated with it. These quantities are given in table.
| Distance | Quantity | Symbol |
| From the pole to the object | object-distance | |
| From the pole to the image | image-distance | |
| From the pole to the focus | focal length | |
| From the pole to the centre | radius of curvature | |
| Height of the object | object-height | |
| Height of the image | image-height |
The above definitions of u and v are for a point object placed on the principal axis. If an object is placed away from the principal axis, u corresponds to the distance from the pole to the foot of the perpendicular drawn from the object to the principal axis. Similarly, v corresponds to the distance from the pole to the foot of the perpendicular drawn from the image to the principal axis. The quantities and
are defined for a linear, extended object placed perpendicular to the principal axis.
Which of the following are correct ? (a) The quantities u and v can be defined for for any object. (b) The quantities (c) Coordinate convention for u, v, f, r are measured from the pole. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) When object-height (b) When object-height | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) The quantities (b) If an object is placed away from the principal axis, v corresponds to the distance from the pole to the foot of the perpendicular drawn from the image to the principal axis. | |||
| Right Option : B | |||
| View Explanation | |||
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