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Caption: A drinking straw is immersed in a glass of water to demonstrate optical refraction. This illusion is due to the difference in the refractive index between water and air.

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Keywords: air, demonstration, education, educational, effect, experiment, geometric, glass of water, illusion, index of refraction, light, optical, optics, phenomenon, physics, ray, refract, refraction, refractive, refractive index, science, scientific, still life, straw, water

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