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What is lateral magnification? How does it vary in different types of spherical mirrors?

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i. Ratio of linear size of image to that of the object, measured perpendicular to the principal axis, is defined as the lateral magnification.

∴ m = \(\frac{h_2}{h_1}=\frac{v}{u}\) (for spherical lenses)

m = \(-\frac{v}{u}\) (for spherical mirrors)

ii. For any position of the object, a convex mirror always forms virtual, erect and diminished image.

Thus, lateral magnification for convex lens is always m < 1.

iii. In the case of a concave mirror, it depends upon the position of the object.

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