Define magnification of lens. Also give the formula to calculate it.

The magnification of lens is defined as the ratio of size of image I to the size of object O or image distance V to the object distance u. 

that is m =I/O =V / U 

Let's explore the magnification formula (M= v/u) for lenses and see how to find the image height and its nature (whether it's real or virtual).Magnification is a measure of the size of an image compared to the size of the object. Lenses and curved mirrors can produce magnified images.Magnification, in optics, the size of an image relative to the size of the object creating it. ... Linear (sometimes called lateral or transverse) magnification refers to the ratio of image length to object length measured in planes that are perpendicular to the optical axis.

A negative magnification indicates that the image is inverted. If the object is placed closer to a converging lens than the focal length, the rays on the far side of the lens diverge.Magnification has no unit. The reason is that it is a ratio of the measurement. It is the ratio of the size of an image to the size of an object. Therefore, it is a dimensionless constant.Magnifying glasses make objects appear larger because their convex lenses (convex means curved outward) refract or bend light rays, so that they converge or come together. ... When light bounces off an object and travels to your eyes, those light rays travel parallel to each other.

There are two types of magnification lenses Simple and Compound lenses. Simple Lenses: It refers to a simple lens that we use to magnify an object. Also, a single lens is the lens that we use to read the newspaper, magnify the things or objects in the front.Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called minification or de-magnification.