- All lenses change the direction of light rays by refraction.
- A converging lense is convex. It causes parallel rays of light to converge.
- Distance from the lens affects the image:
- An object nearer F will make a virtual, magnified, the right way up on the same side as the lens.
- An object between F and 2F will produce a real, upside down and magnified image.
- An object at 2F will produce a real, upside down image the same size as the object.
- The focal length is the distance from the lens to its focal point.
- Use a converging lense to focus and image of a distant object onto a screen. Measure the distance between the lense and the screen to find the focal length.
- A real image is where the light rays converge to form an image that can be projected onto a screen.
- A virtual image is when the light rays are diverging so the light from the object seems to be coming from a different place.
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