Principal axis - The line going through the centre of the lens, Focal point - The point on the principal axis where rays parallel to the principal axis get focused to, Focal length - The distance from the lens to the focal point, Magnification factor - The ratio of the image height to the object height, Diminished - The image height is smaller than the object height, Inverted - The image is upside down compared to the object, Real image - An image that can be formed on a screen, Virtual image - Where virtual rays meet so that we perceive an image,

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