Abstract
In the determination of focal length of large focal length lenses, conventionally, a large length of optical bench is needed to accommodate the experimental set-up, and the measurements are associated with bench errors. In order to overcome these drawbacks, a simple method is suggested wherein the use of a plane mirror reduces the required length of the optical bench by nearly a factor of two and the bench errors are minimized with the use of a travelling microscope for the measurement of distances.
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