Pasco OS-8536 OPTICS TABLE Manuel d'utilisateur télécharger pdf (Page 9)

012-06557A Optics Table

Experiment 2: Dispersion

EQUIPMENT NEEDED

– Cylindrical Lens – Ray Table

– Ray Table Base – Optics Bench

– Light Source – white paper

POWER SUPPLY JACK

12V @ 800mA

OS-8517

LIGHT

SOURCE

TO REPLACE BULB SEE

INSTRUCTION MANUAL.

BULB: 12V 10W G-4

DO NOT TOUCH BULB

WITH FINGERS.

DISCONNECT POWER

BEFORE CHANGING BULB.

TO REMOVE LIGHT SOURCE

GENTLY SPREAD BRACKET.

BASIC OPTICS

scientific

Figure 2.1

Procedure

Mount the Ray Table Base, Ray Table, Cylindrical Lens, and the Light Source on the Optics Bench.

1. Put the Ray Table on the base with the polar grid (DEGREE SCALE) facing up. Turn the Ray Table so the

0 (zero) degree line (NORMAL) points to the Light Source.

2. Set up the equipment as shown in Figure 2.1.

Adjust the slit mask on the Light Source so a

single light ray is incident on the curved sur-

face of the Cylindrical Lens.

Record data

Set the Ray Table so the angle of incidence of the

single ray striking the flat surface of the lens

(from inside the lens) is zero-degrees. Hold a

piece of white paper against the edge of the Ray

Table so the refracted ray is visible on the piece

of paper.

Slowly rotate the Ray Table to increase the angle

of incidence. As you do, watch the refracted ray

on the piece of paper.

1. At what angle of refraction do you begin to no-

tice color separation in the refracted ray?

_____________________________________________________________________________.

2. At what angle of refraction is the color separation

a maximum?

_____________________________________________________________________________..

3. What colors are present in the refracted ray? (Write them in the order of minimum to maximum angle of refrac-

tion.)

4. Measure the index of refraction of acrylic for red and blue light:

(Remember, n

air

sin Incidence

air

= n

acrylic

sin Refraction

acrylic

)

Note: The index of refraction of a given material is usually expressed as a constant. However, different colors

of light refract to slightly different angles, and therefore have slightly different indices of refraction.

red

= __________________

blue

= _________________

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Pasco OS-8536 OPTICS TABLE Manuel d'utilisateur Page 9

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