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B
Polarimeter
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C
Viscometer
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D
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