PASCO OS8170A - Manuals

Brewster’s Angle Accessory Model No. OS-8170A 6 ®® where n is the index of refraction of the medium and  is the angle of the ray from the normal. When the angle of the incident ray is equal to Brewster's angle, p , n 1 sin P = n 2 sin 2 (2) and since P + 2 = 90 o , 2 = 90 o - P , and sin 2 = sin(90...

® Model No. OS-8170A Brewster’s Angle Accessory 7 ® 4. Mount a High Sensitivity Light Sensor to an Aperture Bracket and attach the Aperture Bracket/Light Sensor to the Spectrophotometer Arm.) 5. Mount the Rotary Motion Sensor to the upper holes on the hinge of the Spectrophotometer Base. Mount the S...

Brewster’s Angle Accessory Model No. OS-8170A 8 ®® Align the Laser Beam 1. Put a Laser Diode on the end of the bench opposite to the Spectrophotometer Base.. Connect the laser’s power supply to a grounded electrical outlet and plug the power cord into the laser. Turn on the laser (the ON-OFF switch ...

® Model No. OS-8170A Brewster’s Angle Accessory 9 ® Controlling the Laser Intensity 1. Place the second optics bench at right angles to the first optics bench at the spot where the Beam Splitter is mounted. 2. Mount the second High Sensitivity Light Sensor on an Aperture Bracket, and attach the Aper...

Brewster’s Angle Accessory Model No. OS-8170A 10 ®® 8. The square Analyzing Polarizer (see Figure 9) has its transmission axis marked. Position the Analyzing Polarizer with its label on top and with its axis horizontal. NOTE: When the Analyzing Polarizer is horizontal, the light passing through the ...

® Model No. OS-8170A Brewster’s Angle Accessory 11 ® Note : If the Reflected Light Intensity is as high as possible without exceeding 95%, but the Reference Light Intensity is above 95%, try one of the following to reduce the Reference Light Intensity: • Slightly adjust the second optics bench from ...

Brewster’s Angle Accessory Model No. OS-8170A 12 ®® 3. Remove the Analyzing Polarizer from the Spectrophotometer Arm. Turn the Lens Mount so that the index mark on the high step is at 85° on the Pivot Plate (measured from the zero mark closest to the Beam Splitter). 4. Rotate the Spectrophotometer A...

® Model No. OS-8170A Brewster’s Angle Accessory 13 ® Digits display is the same (or close to it). Adjust the Spectrophotometer Arm so the Digits display of Reflected Light Intensity is a maximum. 11. Repeat steps 6 through 9. 12. Continue to repeat the procedure, reducing the angle of the Lens Mount...

Brewster’s Angle Accessory Model No. OS-8170A 14 ®® 1. To determine Brewster’s Angle, use the Graph display (“Norm +” versus “Angle”). In the Graph, select a group of data points on both sides of the apparent minimum. 2. Click the “Fit” menu in the toolbar of the Graph and select “Quadratic Fit”. ( ...

® Model No. OS-8170A Brewster’s Angle Accessory 15 ® Teacher ’s Guide: Discovering Brewster ’s Angle Sample Data The Table display “Green Data Collection” shows sample data of Angle, Reflected Light Intensity, and Reference Light Intensity for a green (532 nanometer) diode laser.

Brewster’s Angle Accessory Model No. OS-8170A 18 ®® 3. Would Brewster’s Angle be larger or smaller for light in air reflecting off water? The Brewster’s Angle would be smaller for light in air reflecting off water. 4. Would Brewster’s Angle be larger or smaller for light in water reflecting from the...

Brewster’s Angle Accessory Model No. OS-8170A 20 ®® Further Investigation I. Intensity of reflected light (without polarizer) Note: This experiment uses the same setup except the Analyzing Polarizer is removed and you do not need the second optics bench, aperture bracket, and High Sensitivity Light ...

® Model No. OS-8170A Brewster’s Angle Accessory 21 ® 4. In DataStudio, set up the displays as shown below. 5. Repeat this procedure with the lens turned around. Have the flat side of the “D” lens towards the laser. This will show total internal reflection above angles of about 40 degrees. Sample Dat...

Brewster’s Angle Accessory Model No. OS-8170A 22 ®® III. Snell’s Law For the data from the first part of part II, graph Sin (incident angle) vs. Sin (refracted angle). The slope of the line is the refraction index of the acrylic plastic. In DataStudio, create the following equations: a) refracted an...

® Model No. OS-8170A Brewster’s Angle Accessory 23 ® Appendix A: Creating Equations in DataStudio Step 1: Create a new equation. On the main toolbar, click the Calculate button to open the Calculator dialog. In the Calculator dialog, click the New button. Step 2: Type in and/or build the equation. (...

Brewster’s Angle Accessory Model No. OS-8170A 24 ®® Appendix B: Laser Safety Information The OS-8525A Laser Diode is a low power, Class 2 laser. When Class 2 lasers are used in accordance with Occupational Health and Safety Administration (OSHA) standards, Class 2 lasers are not harmful. However, wh...

Brewster’s Angle Accessory Model No. OS-8170A 26 ®® Technical Support For assistance with the OS-8170A Brewster’s Angle Accessory or any other PASCO products, contact PASCO as follows: Address: PASCO scientific 10101 Foothills Blvd. Roseville, CA 95747-7100 Phone: (916) 786-3800 FAX: (916) 786-3292 ...