What do you mean by dynamic spherometer?

An instrument used to measure radius of curvature directly

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An instrument used to measure radius of curvature more accurately than usual spherometer.

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An instrument used to measure radius of curvature indirectly

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None of these

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Solution

The correct option is C An instrument used to measure radius of curvature more accurately than usual spherometer.
Spherometer is a device used to measure radius of curvature or radius of a sphere. Dynamic spherometer is a more accurate device for the same.

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