| Today, Nicol prisms are still very expensive, bulky and of limited aperture. |
| The two beams, with two different planes of polarization, are then analyzed by another Nicol prism. |
| By placing a substance between two Nicol prisms and rotating one, the angle of optical rotation could be easily measured. |
| Polarization can be verified by rotating either the Nicol prism or the Polaroid, which is between the Nicol prism and the lens in the photograph. |
| The Nicol prism, which is made entirely of calcite, a doubly refracting mineral, isolates one beam cleanly. |
| The light is admitted into the far end of the instrument and is polarized by passing through a Nicol prism. |
