Sferometr

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Spherometer used to measure the radius of curvature of the convex lens. Marked important sizes.

Spherometer - A measuring instrument used to measure the radii of spherical elements, such as lenses. Unlike standard circular arcs, measurements are not straightforward. Building

The spherical consists of a base in the form of a metal ring and a clock micrometer or micrometer. For adjusting (resetting) of the spherical, the screw is used to allow free travel of the sensor and a rotary scale, usually calibrated in the tenths or tenths of millimeters.

Measurement run

Measure the radius of curvature by measuring the canopy arrow and the radius (internal or external) of the spherical base, then calculate the radius you want.

To measure the radius of curvature of the lens: Position the spherical lens on the test lens and read the arrow value - h. Measure the outside diameter (when measuring the concave lens) or internal (when measuring convex lenses) of the spherical base - R. Repeat these steps several times, noting the results. Calculate the mean values ​​of the measured values ​​and their errors as the sum of the standard deviation (more correctly: its unladen estimator) and the accuracy of the measuring instrument. Calculate the radius of the sphere - r, using the formula: r = R 2 + h 2 2 h {\displaystyle r={{R^{2}+h^{2}} \over {2h}}} .



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