The Focal Length of a Concave Mirror
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The cardboard box is a very nice tip - I need to stock up!
Rather than a cross-hair source I use greaseproof paper with an arrow marked on it, but your source looks more accurate. Do you draw on the same paper or use something else.
Thanks for this.
yerrahyouknow 3 years ago
Thanks. The cardboard box is definitely easier than cramming a human pyramid into our tiny dark room. The source came as part of a Unilab kit. There's a still of it in the focal length of a converging lens video.
c4science 3 years ago