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RE: Help Again,
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Bill on August 3, 2000 13:55:33 UTC |
One way to measure focal length is take the rough ground mirror outside on a sunny day, spray it with water, and get the mirror to focus the sun`s disk on a sheet of paper or on the side of your house. The distance between the mirror and focused sun image is the focal length of the mirror. I have used this method and can measure the focal length to within a few inches or less.
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