Pasco OS-8515C Basic Optics System Manuel d'utilisateur télécharger pdf (Page 22)

Basic Optics System Experiment 7: Hollow Lens

Repeat this step with water in different section of the lens to complete the first

four rows of Table 7.1.

4. Put the white plastic sheet in the transparent ray-optics box. Put the hollow lens

in the box on top of the sheet as shown in Figure 7.2. Place a small weight on top

of the lens to stop it from floating. Position the light source outside of the box so

that the rays enter the hollow lens through the flat side.

Figure 7.2: Hollow lens set up for testing surrounded by water

5. Fill the box with water to just below the top of the lens. Fill sections 2 and 3 of

the lens with water (leaving section 1 “filled” with air). Record your observation

in Table 7.1.

Repeat this step with air in different section of the lens to complete Table 7.1.

Questions

1. Under what conditions is a plano-convex lens converging? Under what condi-

tions is it diverging?

2. If a plano-concave lens of an unknown material is a diverging lens when sur-

rounded by air, is it possible to know whether the lens will be converging or

diverging when placed in water? Explain.

Table 7.1: Predictions and Observations

Lens

surrounded by:

Section 1

filled with:

Section 2

filled with:

Section 3

filled with:

Prediction

(converging or diverging)

Observation

(converging or diverging)

Air

Water Air Air

Air Water Air

Air Air Water

Water Air Water

Water

Air Water Water

Water Air Water

Water Water Air

Incident rays

Box

Hollow lens

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 70 71

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Pasco OS-8515C Basic Optics System Manuel d'utilisateur Page 22

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