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Finding the Focal Length of a Lens.
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- Words:
- 1739
- Submitted:
- Thu Mar 18 2004
... Finding the Focal Length of a Lens From Activity 23 (1) The Into Lenses have fascinated physicists ever since... well they have fascinated Mr. E. Allen so that's more than enough. Anyway, lenses can be used to modify images in a number of ways. They can be used to focus, blur, enlarge, reduce (which is still technically an enlargement with a factor less than one) and flip an image upside-down. With all of these properties, there must be some rules governing how a lens works. In physics this means there are some mathematical rules, which can be shown through equations. For lenses, there is the lens equation, which states that when the image is focused: u - Object to lens distance v - Lens to image distance - Focal length The Lens Equation (2) There is also another equation relating the focal length of a lens to the power of the lens: and thus P - Power
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