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  "gravityAcceleration": 9.8,
  "coulombK": 8987551792.3,
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        "width": 1000,
        "height": 104,
        "text": "**探究光的反射定律**\n\n单束光 · 平面镜 · 量角器　｜　初始入射角 45°",
        "fontSize": 18,
        "fontWeight": 400,
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        },
        "locked": true,
        "width": 1000,
        "height": 116,
        "text": "**测量任务**\n以法线为零方向，分别读取入射角和反射角。将镜面与量角器同步转至 −15°、0°、15°，记录三组角度。",
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      "type": "Protractor",
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        "radius": 270,
        "ringWidth": 45,
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        "thickness": 10,
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        "lineHeight": 1.5,
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        "fontSize": 17,
        "fontWeight": 400,
        "lineHeight": 1.5,
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        "text": "**记录表**　入射角 i：____　反射角 r：____\n法线垂直于镜面；角度从法线量起。",
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