{
  "schema": "physics-anim-scene",
  "version": 1,
  "pixelsPerMeter": 1000,
  "gravityAcceleration": 9.8,
  "coulombK": 8987551792.3,
  "timeScale": 1,
  "view": {
    "x": 30,
    "y": 25,
    "scale": 0.82
  },
  "canvasBackground": {
    "mode": "coordinate",
    "origin": {
      "x": 540,
      "y": 380
    }
  },
  "entities": [
    {
      "id": 1,
      "type": "RichTextEditor",
      "state": {
        "pos": {
          "x": 540,
          "y": 62
        },
        "locked": true,
        "width": 1000,
        "height": 104,
        "text": "**探究平面镜成像特点**\n\n物高 8 cm　｜　初始物距 25 cm　｜　物与像的位置测量",
        "fontSize": 18,
        "fontWeight": 400,
        "lineHeight": 1.5,
        "padding": 16,
        "backgroundColor": "#ffffff",
        "backgroundOpacity": 0.96,
        "textColor": "#17324d",
        "borderColor": "#2563eb",
        "borderWidth": 1,
        "cornerRadius": 8,
        "showBorder": true
      }
    },
    {
      "id": 2,
      "type": "RichTextEditor",
      "state": {
        "pos": {
          "x": 540,
          "y": 739
        },
        "locked": true,
        "width": 1000,
        "height": 116,
        "text": "**测量任务**\n改变物体到镜面的距离，测量像距与像高。把光屏放在像的位置，判断该像能否由实际光线投射到屏上。",
        "fontSize": 16,
        "fontWeight": 400,
        "lineHeight": 1.5,
        "padding": 16,
        "backgroundColor": "#ffffff",
        "backgroundOpacity": 0.96,
        "textColor": "#17324d",
        "borderColor": "#ccdbe8",
        "borderWidth": 1,
        "cornerRadius": 8,
        "showBorder": true
      }
    },
    {
      "id": 3,
      "type": "Ruler",
      "state": {
        "pos": {
          "x": 540,
          "y": 560
        },
        "locked": true,
        "length": 920,
        "thickness": 38,
        "unit": "cm",
        "minorStep": 1,
        "majorEvery": 5,
        "showMeasure": false,
        "showEntityMarkers": false,
        "fillColor": "#eef5ff",
        "strokeColor": "#2563eb"
      }
    },
    {
      "id": 4,
      "type": "OpticalObject",
      "state": {
        "pos": {
          "x": 290,
          "y": 380
        },
        "locked": false,
        "heightPx": 80,
        "color": "#243c54",
        "rayColor": "#087e8b",
        "showRays": true,
        "raysMode": "bundle",
        "bundleCount": 3,
        "bundleSpreadDeg": 10,
        "strictCompoundImaging": true,
        "showAllLensImages": false
      }
    },
    {
      "id": 5,
      "type": "PlaneMirror",
      "state": {
        "pos": {
          "x": 540,
          "y": 380
        },
        "locked": false,
        "length": 310,
        "angleDeg": 90,
        "thickness": 9,
        "flipNormal": false
      }
    },
    {
      "id": 6,
      "type": "OpticalScreen",
      "state": {
        "pos": {
          "x": 930,
          "y": 380
        },
        "locked": false,
        "length": 220,
        "angleDeg": 90,
        "color": "#17324d",
        "showHits": true,
        "hitRadius": 4,
        "blocksRays": true
      }
    },
    {
      "id": 7,
      "type": "RichTextEditor",
      "state": {
        "pos": {
          "x": 220,
          "y": 195
        },
        "locked": true,
        "width": 220,
        "height": 66,
        "text": "**物体**\n保持高度不变",
        "fontSize": 16,
        "fontWeight": 400,
        "lineHeight": 1.5,
        "padding": 16,
        "backgroundColor": "#ffffff",
        "backgroundOpacity": 0,
        "textColor": "#17324d",
        "borderColor": "#ccdbe8",
        "borderWidth": 1,
        "cornerRadius": 8,
        "showBorder": false
      }
    },
    {
      "id": 8,
      "type": "RichTextEditor",
      "state": {
        "pos": {
          "x": 780,
          "y": 195
        },
        "locked": true,
        "width": 290,
        "height": 66,
        "text": "**虚像区**\n观察光线的反向延长线",
        "fontSize": 16,
        "fontWeight": 400,
        "lineHeight": 1.5,
        "padding": 16,
        "backgroundColor": "#ffffff",
        "backgroundOpacity": 0,
        "textColor": "#17324d",
        "borderColor": "#ccdbe8",
        "borderWidth": 1,
        "cornerRadius": 8,
        "showBorder": false
      }
    },
    {
      "id": 9,
      "type": "RichTextEditor",
      "state": {
        "pos": {
          "x": 540,
          "y": 625
        },
        "locked": true,
        "width": 900,
        "height": 64,
        "text": "**坐标背景下**　镜面中心为原点；物体和光屏中心 y = 0。\n尺上读取的是坐标差；物距与像距都从镜面开始量。",
        "fontSize": 16,
        "fontWeight": 400,
        "lineHeight": 1.5,
        "padding": 8,
        "backgroundColor": "#ffffff",
        "backgroundOpacity": 0.96,
        "textColor": "#17324d",
        "borderColor": "#ccdbe8",
        "borderWidth": 1,
        "cornerRadius": 8,
        "showBorder": true,
        "textAlign": "center"
      }
    }
  ]
}