Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur télécharger pdf (Page 32)

Introductory Optics System 012-02744K

Figure 10.3 Equipment Setup

Procedure

Set up the equipment as shown in Figure 10.2. Turn the Light Source on and view the Crossed Arrow Target

with both Polarizers removed. Replace Polarizer A on the Component Holder. Rotate the Polarizer while

viewing the target.

➀ Does the target seem as bright when looking through the Polarizer as when looking directly at the target? Why?

_______________________________________________________________________

_______________________________________________________________________.

➁ Is the light from the Light Source plane polarized? How can you tell?__________________

____________________________________________________________________.

Align Polarizer A so it transmits only vertically polarized light. Replace Polarizer B on the other Component

Holder. Looking through both polarizers, rotate Polarizer B.

➂ For what angles of Polarizer B is a maximum of light transmitted? For what angles is a minimum of light

transmitted?_________________________________________________

____________________________________________________________________.

Polarization by Reflection: Brewster’s Angle

Set up the equipment as shown in Figure 10.3. Adjust the components so a single ray of light passes

through the center of the Ray Table. Notice the rays that are produced as the incident ray is reflected and

refracted at the flat surface of the Cylindrical Lens. (The room must be reasonably dark to see the

reflected ray.)

Rotate the Ray Table until the angle between the reflected and refracted rays is 90°. Arrange the Ray

Table Component Holder so it is in line with the reflected ray. Look through the Polarizer at the filament

of the light source (as seen reflected from the Cylindrical Lens), and rotate the Polarizer slowly through

all angles.

➀ Is the reflected light plane polarized? If so, at what angle from the vertical is the plane of polarization?

____________________________________________________________________

____________________________________________________________________.

Observe the reflected image for other angles of reflection.

➁ Is the light plane polarized when the reflected ray is not at an angle of 90° with respect to the refracted

ray? Explain. ____________________________________________________________________

____________________________________________________________________.

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Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur Page 32