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B a s i c O p t i c s S y s t e m
E x p e r i m e n t 7 : H o l l o w L e n s
20
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
Summary of Contents for OS-8515B
Page 6: ... Basic Optics System About the Experiments 6 ...
Page 26: ... Basic Optics System Experiment 9 Apparent Depth 26 ...
Page 38: ... Basic Optics System Experiment 13 Telescope 38 ...
Page 42: ... Basic Optics System Experiment 14 Microscope 42 ...
Page 44: ... Basic Optics System Experiment 15 Shadows 44 ...
Page 46: ... Basic Optics System Telescope and Microscope Test Pattern 46 ...