The file contains two mirrors round and square with the effect of infinity. To achieve the result presented in the preview set the Max ray depth parameter to a value from 50 to 100 (Performance tab). The settings are relevant for Corona Render.
Website: https://russian.alibaba.com/p-detail/Round-62482699941.html?spm=a2700.details.0.0.39dc3486O6oBHc 
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