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.
If the image is formed on the same side of the principal axis that is ____________ the image-height is also positive.
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Right Option : A | |||
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According to the sign conventions the focal length of ________________ mirror is positive . | |||
Right Option : A | |||
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Which of the following are correct ? (a) When object-height is positive and the image-height is positive and are of equal value we can say that the image is formed is inverted (b) When object-height is more that the image-height and both are positive we can say that the image is formed is erect and diminished. | |||
Right Option : A | |||
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