This demonstration elegantly uses the refractive differences of oil and water to create a functional bifocal system from scratch. It is a brilliant example of how basic materials can be used to visualize sophisticated optical physics.
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Two-Layer Lens: An Optical Experiment with Oil and WaterHinzugefügt:
What happens if you make a lens out of two immiscible liquids? I'm going to use distilled water slightly tinted with dye and sunflower oil. They have different densities, so they don't mix together.
First, I fill the flask halfway with water. Then I add the oil. It forms a smooth layer right on top. The result is a lens where the bottom part has one focal length and the top part has another. This kind of lens can focus on both distant and close objects simultaneously in the same frame.
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