principle of optical Lever method
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An optical lever is a convenient device to magnify a small displacement and thus to make possible an accurate measurement of the displacement. Experiment M-11, Young's modulus, uses an optical lever to magnify the extension of a wire produced by a series of different loads.
The plate P carries a mirror M. The mirror mount has two points resting in a fixed groove, F, and at the other end has a single point resting on the object whose displacement one is measuring. Raising the object through a distance $ \Delta$L will tilt the mirror through an angle $ \theta$ or $ \Delta$L/d radians (approximately) but will turn the light beam through an angle 2$ \theta$.
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