Define object Distance
Image distance focal
length
principal axis
.
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Object distance: Whatever the distance is from the pole of the mirror or lens is called its object distance. It is denoted by the letter small u.
Image distance: Whatever the distance of a formed image from the pole of the mirror or the centre of the lens is called image1 distance.
Focal length: The distance between the pole of the morror or the lens is called the focal length.
Principal axis: It is the imaginary line drawn from the centre of the lens or from the pole of the mirror to the focus.
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