What is the polygon of the Fresnel lens?

What is the polygon of the Fresnel lens?
Such as solar concentrating batteries, the condenser is 500 times, how is it achieved?
Sun Fresnel lens condenser, the focus of the lens just fell on the photovoltaic cell. When the lens surface facing the sun, the light will be focused on the photovoltaic cell, bringing together more energy, which requires a smaller area of photovoltaic cells, significant cost savings.
Condensation ratio K: available formula: K = lighting area / focal area.

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