diff --git a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.es.md b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.es.md
deleted file mode 100644
index b43652c4a..000000000
--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.es.md
+++ /dev/null
@@ -1,7 +0,0 @@
----
-title: 'nuevo curso: principal'
-published: false
-visible: false
----
-
-nuevo curso: principal
\ No newline at end of file