Converging Lens Diverging Lens
Use of a hydraulic lift at the airport
Hydraulic lift is an effective, precise, and quiet tool. It is used to lift the baggage to the aircraft. (photo by Sr. H.)
Hydrometer submerged in water
The hydrometer is designed to measure a density of liquids. The density is shown the liquid surface on the hydrometer's scale.
Hydrometer presented in the picture looks like a broken one - part of it visible above the water surface seems to be disconnected. This is an effect of refraction.
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