Rotation of plane polarised light is measured by

Manometer

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Polarimeter

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Viscometer

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Refractometer

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Solution

The correct option is B Polarimeter
Polari meter is an instrument used for measuring the angle of rotation of a plane polarised light. It consists of two nicol prisms.
One called the polarizer (near the light source) and the other called the analyser (near the eye). A glas tube containing the solution of an optically active compound is placed in between the polarizer and analyser

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