Experiment 3: The Index of Refraction of Glass EQUIPMENT NEEDED: Basic Interferometer (OS-9255A) – Read Angle of Laser (OS-9171) – Inclination on Laser Alignment Bench (OS-9172) – Degree Scale Interferometer Accessories – Rotating Table, Glass Plate Introduction In Experiment 2, the index of refraction of air was plate measured by slowly varying the density of air along a fixed length of one beam path in the Michelson Interferometer. That method obviously won't work with a solid substance, such as glass. Therefore, in order to measure the index of refraction of glass, it's necessary to slowly vary the length of glass through which the interferometer beam passes. This experi- ment introduces a technique for making such a measurement. Procedure 1. Align the laser and interferometer in the Michelson OS-9255A 1 d = 1 PREC/S/ON path. mode. See Setup and Operation. 2. Place the rotating table between the beam-splitter Figure 3.1. Equipment Setup and movable mirror, perpendicular to the optical NOTE: if the movable mirror is too far forward, the rotating table won't fit. You may ➤ need to loosen the thumbscrew and slide the mirror farther back. 3. Mount the glass plate on the magnetic backing of the rotational pointer. 4. Position the pointer so that its edge on the Vernier scale is lined up with the zero on the “0” degree scale on the interferometer base. 5. Remove the lens from in front of the laser. Hold the viewing screen between the glass plate and the movable mirror. If there is one bright dot and some secondary dots on the
Experiment 3: The Index of Refraction of Glass EQUIPMENT NEEDED: – Basic Interferometer (OS-9255A) – Laser (OS-9171) – Laser Alignment Bench (OS-9172) – Interferometer Accessories Rotating Table, Glass Plate Introduction In Experiment 2, the index of refraction of air was measured by slowly varying the density of air along a fixed length of one beam path in the Michelson Interferometer. That method obviously won't work with a solid substance, such as glass. Therefore, in order to measure the index of refraction of glass, it's necessary to slowly vary the length of glass through which the interferometer beam passes. This experi- ment introduces a technique for making such a measurement. Procedure 1. Align the laser and interferometer in the Michelson OS-9255A PREC/S/ON plate 1 = 1 Read Angle of Inclination on Degree Scale mode. See Setup and Operation. 2. Place the rotating table between the beam-splitter and movable mirror, perpendicular to the optical path. Figure 3.1. Equipment Setup ➤ NOTE: if the movable mirror is too far forward, the rotating table won't fit. You may need to loosen the thumbscrew and slide the mirror farther back. 3. Mount the glass plate on the magnetic backing of the rotational pointer. 4. Position the pointer so that its “0” edge on the Vernier scale is lined up with the zero on the degree scale on the interferometer base. 5. Remove the lens from in front of the laser. Hold the viewing screen between the glass plate and the movable mirror. If there is one bright dot and some secondary dots on the d
Precision%20InterferometerSum2014.docx