Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur télécharger pdf (Page 16)

Introductory Optics System 012-02744K

Procedure

Set up the equipment as shown in Figure 2.1. Adjust the components so a single ray of light

is aligned with the bold arrow labeled “Normal” on the Ray Table Degree Scale. Carefully

align the flat reflecting surface of the mirror with the bold line labeled “Component” on the

Ray Table. With the mirror properly aligned, the bold arrow on the Ray Table is normal (at

right angles) to the plane of the reflecting surface.

Rotate the Ray Table and observe the light ray. The angles of incidence and reflection are

measured with respect to the normal to the reflecting surface, as shown in Figure 2.2.

By rotating the Ray Table, set the angle of incidence to each of the settings shown in Table

2.1. For each angle of incidence, record the angle of reflection (Reflection

). Repeat your

measurements with the incident ray coming from the opposite side of the normal (Reflec-

tion

➀ Are the results for the two trials the same? If not, to what do you attribute the differences?

________________________________________________________________________

➁ Part of the law of reflection states that the incident ray, the normal and the reflected ray all lie

in the same plane. Discuss how this is shown in your experiment

_____________________________________________________________________________________________.

➂ What relationship holds between the angle of incidence and the angle of reflection?

______________________________________________________________________________

Additional Questions

➀ The Law of Reflection has two parts. State both

parts.

➁ You were asked to measure the angle of reflection

when the ray was incident on either side of the

normal to the surface of the mirror. What advan-

tages does this provide?

➂ Physicists expend a great deal of energy in attempts

to increase the accuracy with which an exact law

can be proven valid. How might you test the Law

of Reflection to a higher level of accuracy than in

the experiment you just performed?

Angle of: Incidence Reflection

Reflection

0°

10°

20°

30°

40°

50°

60°

70°

80°

90°

Table 2.1 Data

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 74 75

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Pasco OS-8500 INTRODUCTORY OPTICS SYSTEM Manuel d'utilisateur Page 16

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