Optical activity is measured by

Options

(a) spectrograph
(b) Polarimeter
(c) tracer technique
(d) refractometer

Correct Answer:

Polarimeter

Explanation:

Optically active substances is one that rotates the plane of polarised light.If the rotation of the plane is to the right (clockwise), the substance is said to be dextrorotatary. If the rotation is to the left. (anticlockwise), the substances is leavorotatory. The apparatus which measures the extent of rotation of the polarised light is called Polarimeter.