Correct Answer - Option 3 : Polarimeter
CONCEPT:
A light wave that has vibrations in more than one plane is known as unpolarized light.
Polarized waves are light waves in which the vibrations occur in a single plane.
Optical rotation: The optical rotation is the angle through which the plane of polarization is rotated when polarized light passes through a layer of liquid.
EXPLANATION:
- The polarimeter is an instrument used for measuring optical rotation.
- It consists of two Nicol prisms, one called the polarizer (near the eye) and the other one is known as an analyzer.
- In between the polarizer and analyzer, a glass tube containing the solution of an optically active compound is placed. Hence, option 3 is correct.
