# Magnification. Image Size  The image produced by a lens is typically a different size than the object.  An object and image are measured by relative.

## Presentation on theme: "Magnification. Image Size  The image produced by a lens is typically a different size than the object.  An object and image are measured by relative."— Presentation transcript:

Magnification

Image Size  The image produced by a lens is typically a different size than the object.  An object and image are measured by relative distance. Distance from the lens sDistance from the lens s Distance in plane yDistance in plane y sosososo yoyoyoyo yiyiyiyi sisisisi object image

Inverted Image  Images in a single convex lens are inverted. Negative planar distanceNegative planar distance y i < 0y i < 0  Images can have negative distance from the lens. Virtual imageVirtual image sosososo yoyoyoyo sisisisi object image yiyiyiyi

Magnification Ratio  The ratio of the image size to the object size is the magnification M. Negative for inverted images  From geometry this equivalent to the ratio of the image distance to the object distance. sosososo yoyoyoyo sisisisi object image yiyiyiyi

Single Lens  A single converging lens will magnify objects. Always inverts  A real image requires a positive object distance. s o > f  A real image requires a positive image distance. s i > f sosososo yoyoyoyo sisisisi object image yiyiyiyi

Photocopier  A photocopier needs to create an image exactly the same size as the object. Object at twice focal lengthObject at twice focal length

Projector  A projector needs a larger image at a distant screen. Real image Inverted object Object between f and 2f

Magnifying Glass  A magnifying glass works on objects within the focal length. Upright virtual imageUpright virtual image Eye needed to focusEye needed to focus next

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