A father ignited a 2,000-square-metre lawn using a magnifying glass during an experiment with his son in eastern China.

The video, filmed in the city of Shanghai on February 21, shows fire spreading on the lawn after a father named Liu and his son used a magnifying glass to concentrate sunlight to ignite the grass.

Liu reportedly called the firefighters to the scene but as they arrived he and his son left the site sneakily.

Police found that Liu was the person who set the fire after checking the surveillance camera and Liu also admitted it was his fault.

Police have fined him. The video was provided by local media with permission.

父亲带儿子做放大镜聚光实验，结果点燃了上海光明生态园2000平方米草坪。
近日，上海浦东警方联合消防部门成功查处一起人为引发的火灾，涉案嫌疑人刘先生被处以行政处罚，并责令其赔偿生态园经济损失。
2月21日，上海的刘先生带着儿子到上海国际旅游度假区光明生态园的一片草坪上做“聚焦生火”的实验，结果火势一发不可收拾，刘先生以游客身份拨打了119，消防部门赶赴现场将火扑灭，而刘先生竟和儿子悄悄离开了现场。警方联合消防调查，通过调阅公共视频发现报火警的刘先生就是放火者，面对民警，刘先生主动承认了由于自己过失引发火灾的事实并表示愿意赔偿火灾导致的经济损失。目前，警方已对刘先生进行批评教育，并对其处以行政处罚。（视频由上海台提供）