diff --git a/notes/.obsidian/plugins/obsidian-activity-history/data.json b/notes/.obsidian/plugins/obsidian-activity-history/data.json
index cbbe901..741ef0d 100644
--- a/notes/.obsidian/plugins/obsidian-activity-history/data.json
+++ b/notes/.obsidian/plugins/obsidian-activity-history/data.json
@@ -13,7 +13,7 @@
     {
       "path": "/",
       "date": "2023-09-21",
-      "size": 1435874
+      "size": 1438800
     }
   ],
   "activityHistory": [
@@ -1346,7 +1346,7 @@
         },
         {
           "date": "2023-09-21",
-          "value": 20644
+          "value": 23570
         }
       ]
     }
diff --git a/notes/.obsidian/workspace.json b/notes/.obsidian/workspace.json
index ac67d7d..9dc675d 100644
--- a/notes/.obsidian/workspace.json
+++ b/notes/.obsidian/workspace.json
@@ -19,6 +19,16 @@
               }
             }
           },
+          {
+            "id": "64ec9359e088737e",
+            "type": "leaf",
+            "state": {
+              "type": "excalidraw",
+              "state": {
+                "file": "data/Odraz světla 2023-09-21 14.11.58.excalidraw.md"
+              }
+            }
+          },
           {
             "id": "d67f7f76e78f9b41",
             "type": "leaf",
@@ -259,12 +269,13 @@
   },
   "active": "bcb851dbd0686376",
   "lastOpenFiles": [
+    "data/Odraz světla 2023-09-21 14.11.58.excalidraw.md",
     "mat/Funkce/Goniometrické funkce.md",
+    "data/Uplny odraz svetla 2023-09-21 12.58.19.excalidraw.md",
     "fyz/Svetlo/Odraz světla.md",
     "mat/Funkce/Vlastnosti funkcí.md",
     "mat/Funkce/Sinus.md",
     "fyz/Svetlo/Uplny odraz svetla.md",
-    "data/Uplny odraz svetla 2023-09-21 12.58.19.excalidraw.md",
     "data/Uplny odraz svetla 2023-09-21 12.52.08.excalidraw.md",
     "eko/eko.md",
     "fyz/fyz.md",
@@ -288,7 +299,6 @@
     "fyz/Svetlo/Svetlo.md",
     "fyz/Svetlo",
     "mat/Ekvigonala.md",
-    "README.md",
     "PRA",
     "Maturitni cetba",
     "projects/dvop",
diff --git a/notes/data/Odraz světla 2023-09-21 14.11.58.excalidraw.md b/notes/data/Odraz světla 2023-09-21 14.11.58.excalidraw.md
new file mode 100644
index 0000000..765cbe4
--- /dev/null
+++ b/notes/data/Odraz světla 2023-09-21 14.11.58.excalidraw.md	
@@ -0,0 +1,134 @@
+---
+
+excalidraw-plugin: parsed
+tags: [excalidraw]
+
+---
+==⚠  Switch to EXCALIDRAW VIEW in the MORE OPTIONS menu of this document. ⚠==
+
+
+# Text Elements
+%%
+# Drawing
+```json
+{
+	"type": "excalidraw",
+	"version": 2,
+	"source": "https://github.com/zsviczian/obsidian-excalidraw-plugin/releases/tag/1.9.3",
+	"elements": [
+		{
+			"id": "YW40eJ99o9HZ9mUcAYJ0n",
+			"type": "line",
+			"x": -786.75,
+			"y": -21.5,
+			"width": 1480,
+			"height": 0,
+			"angle": 0,
+			"strokeColor": "#1e1e1e",
+			"backgroundColor": "transparent",
+			"fillStyle": "hachure",
+			"strokeWidth": 1,
+			"strokeStyle": "solid",
+			"roughness": 1,
+			"opacity": 100,
+			"groupIds": [],
+			"roundness": {
+				"type": 2
+			},
+			"seed": 90652168,
+			"version": 143,
+			"versionNonce": 420910856,
+			"isDeleted": false,
+			"boundElements": null,
+			"updated": 1695298327083,
+			"link": null,
+			"locked": false,
+			"points": [
+				[
+					0,
+					0
+				],
+				[
+					1480,
+					0
+				]
+			],
+			"lastCommittedPoint": null,
+			"startBinding": null,
+			"endBinding": null,
+			"startArrowhead": null,
+			"endArrowhead": null
+		},
+		{
+			"id": "fxvBruxaXbcxq7zEtIZ1q",
+			"type": "line",
+			"x": -81.75,
+			"y": -668.5,
+			"width": 2,
+			"height": 1186,
+			"angle": 0,
+			"strokeColor": "#1e1e1e",
+			"backgroundColor": "transparent",
+			"fillStyle": "hachure",
+			"strokeWidth": 1,
+			"strokeStyle": "solid",
+			"roughness": 1,
+			"opacity": 100,
+			"groupIds": [],
+			"roundness": {
+				"type": 2
+			},
+			"seed": 445136248,
+			"version": 85,
+			"versionNonce": 1482450808,
+			"isDeleted": false,
+			"boundElements": null,
+			"updated": 1695298330139,
+			"link": null,
+			"locked": false,
+			"points": [
+				[
+					0,
+					0
+				],
+				[
+					-2,
+					1186
+				]
+			],
+			"lastCommittedPoint": null,
+			"startBinding": null,
+			"endBinding": null,
+			"startArrowhead": null,
+			"endArrowhead": null
+		}
+	],
+	"appState": {
+		"theme": "light",
+		"viewBackgroundColor": "#ffffff",
+		"currentItemStrokeColor": "#1e1e1e",
+		"currentItemBackgroundColor": "transparent",
+		"currentItemFillStyle": "hachure",
+		"currentItemStrokeWidth": 1,
+		"currentItemStrokeStyle": "solid",
+		"currentItemRoughness": 1,
+		"currentItemOpacity": 100,
+		"currentItemFontFamily": 1,
+		"currentItemFontSize": 20,
+		"currentItemTextAlign": "left",
+		"currentItemStartArrowhead": null,
+		"currentItemEndArrowhead": "arrow",
+		"scrollX": 2193.3750000000014,
+		"scrollY": 2068.166666666667,
+		"zoom": {
+			"value": 0.47999999999999965
+		},
+		"currentItemRoundness": "round",
+		"gridSize": null,
+		"currentStrokeOptions": null,
+		"previousGridSize": null
+	},
+	"files": {}
+}
+```
+%%
\ No newline at end of file
diff --git a/notes/data/data.md b/notes/data/data.md
index 395f008..2ae956d 100644
--- a/notes/data/data.md
+++ b/notes/data/data.md
@@ -35,6 +35,7 @@ imagePrefix: 'data/'
 -  [[data/Matice.bmp|Matice.bmp]]
 -  [[data/Metrický závit.bmp|Metrický závit.bmp]]
 -  [[data/Odraz světla 2023-09-14 13.19.17.excalidraw|Odraz světla 2023-09-14 13.19.17.excalidraw]]
+-  [[data/Odraz světla 2023-09-21 14.11.58.excalidraw|Odraz světla 2023-09-21 14.11.58.excalidraw]]
 -  [[data/Opakující se prvky_2021-11-26 12.28.49.excalidraw|Opakující se prvky_2021-11-26 12.28.49.excalidraw]]
 -  [[data/Pasted image 20210917093532.png|Pasted image 20210917093532.png]]
 -  [[data/Pasted image 20210920101314.png|Pasted image 20210920101314.png]]
diff --git a/notes/fyz/Svetlo/Odraz světla.md b/notes/fyz/Svetlo/Odraz světla.md
index 6c6dd84..189b432 100644
--- a/notes/fyz/Svetlo/Odraz světla.md	
+++ b/notes/fyz/Svetlo/Odraz světla.md	
@@ -94,3 +94,4 @@ $x_2=15cm$
 
 Určete úhel dopadu světla na rozhraní vody ($n_v = 1.33$) a skla ($n_s = 1,5$), svírá-li odražený paprsek s paprskem lomeným úhel $120\degree$.
 
+![[Odraz světla 2023-09-21 14.11.58.excalidraw]]
\ No newline at end of file