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But this is the history of mankind. The creation and promotion of glass is a chain of events, from one thing to another, and sometimes these chain reactions end in disaster, sometimes in beauty. When you look at it from an Angle, the glass appears beautiful, reflecting a rainbow of light that has been flowing brightly for eons of time. When you look at it from another Angle, it's hellfire.

In practical work, solar cells are the basic devices that play the photovoltaic effect. When sunlight strikes the semiconductor material of the solar cell, the photons are absorbed and excited electrons in the semiconductor material. These excited electrons are subjected to an electric field, which forms an electric current.