A new method of determining the focal length of converging lenses
Book details
- Title
- A new method of determining the focal length of converging lenses
- Publication year listed
- 1909
- Format
- Public domain eBook
- Reading access
- Free online reader; no registration required
- Source record
- View on Archive.org
About this book
A new method of determining the focal length of converging lenses
Year: 1909
Describes a new method of determining the focal length of a converging lens by measuring the linear diam. of a circular fringe in the real image formed by the lens. The method makes use of the system of concentric circular fringes obtained by the interference of the light reflected from a partial silver film with that reflected from a heavy polished silver film parallel to the first and behind it, the light being normal to the mirrors. The theory of the method is discussed, and results in a simple working formula, from which the focal length of the lens under test can be easily obtained for any given wave-length. Possible sources of error and the precision of the method are dealt with at some length, and it is shown that a single careful measur
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