What is the magnification of convex lens?

As a physics teacher, I always start by explaining that magnification tells us how much larger or smaller the image is compared to the object. For convex lenses, magnification can be greater than 1 (enlarged), equal to 1 (same size), or less than 1 (reduced). The formula m = height of image/height of object = v/u is crucial. What's fascinating is that the same lens can give different magnifications just by changing the object distance. This principle is used in zoom lenses - they actually move lens elements to change effective focal length and thus magnification.

Magnification (M) of a convex lens is defined as the ratio of the height of the image to the height of the object. The formula is: M = v / u where v = image distance from the lens, and u = object distance. Convex lenses can give both magnified real images (when object is beyond focal length) and magnified virtual images (when object is within focal length).

In practical terms: if you use a convex lens as a magnifying glass, the magnification is greater than 1 (image looks bigger). If you project an image on a screen using the lens, depending on object distance, magnification can be less than or more than 1. It’s not fixed, it changes based on positioning.

The magnification of a convex lens isn't a fixed number - it depends on where the object is placed relative to the lens. The magnification formula is m = v/u where v is image distance and u is object distance (with sign conventions). Some key points:- When object is beyond 2F, image is diminished (m < 1)- When object is at 2F, image is same size (m = 1)- When object is between F and 2F, image is magnified (m > 1)The maximum possible magnification depends on the lens's focal length. Convex lenses can produce both magnified and diminished images depending on object position, which is why they're used in everything from cameras to magnifying glasses to microscopes!