reflection / endoscopy
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reflection
The bouncing back of light, sound, or other waves from a surface. Also the image that is created in a mirror or on a smooth surface as a result.
Die Spiegelung der alten Häuser im Kanal war ein wunderschönes Fotomotiv.
The reflection of the old houses in the canal was a beautiful photo subject.
endoscopy
A medical examination in which a doctor looks inside the body or an organ with an endoscope. Examples include a gastroscopy or colonoscopy.
Der Arzt empfahl eine Spiegelung des Magens, um die Ursache der Beschwerden zu finden.
The doctor recommended an endoscopy of the stomach to find the cause of the symptoms.
reflection
In geometry, a transformation in which a point or figure is mirrored across an axis or plane, creating a symmetrical image.
Die Aufgabe in der Klassenarbeit war, das Dreieck durch eine Spiegelung an der y-Achse abzubilden.
The task in the class test was to map the triangle through a reflection across the y-axis.
'Spiegelung' (reflection/endoscopy) is a noun derived from the verb 'spiegeln' (to mirror/reflect). The ending '-ung' is often used in German to form a feminine noun from a verb that describes the action or the result.
Das ruhige Wasser spiegelt die Landschaft perfekt wider.
The calm water reflects the landscape perfectly.
When an optical image is involved, you often find 'Spiegelung' (reflection) in connection with smooth surfaces. Watch for words like 'Wasser' (water), 'See' (lake), 'Fenster' (window), or 'Spiegel' (mirror).
Ich sehe meine Spiegelung im Schaufenster.
I can see my reflection in the shop window.
In a medical context, 'Spiegelung' (endoscopy) is almost always used as part of a compound word. These words describe exactly which organ is being examined, e.g. 'Magenspiegelung' (gastroscopy) or 'Darmspiegelung' (colonoscopy).
Für die Darmspiegelung musste er einen Tag im Krankenhaus bleiben.
For the colonoscopy, he had to stay in the hospital for a day.
In mathematics, you can recognize this meaning from words like 'Achse' (axis), 'Punkt' (point), 'Gerade' (line), or 'Figur' (figure). The preposition 'an' is typical here.
Die Spiegelung des Punktes an der y-Achse ist einfach zu berechnen.
The reflection of the point across the y-axis is easy to calculate.
reflection
Reflexion and Spiegelung can both refer to light being reflected or to the image that results. Reflexion tends to emphasize the physical process and is the corresponding technical term. In everyday language, Spiegelung often refers to the visible image on a smooth surface.
In der Spiegelung auf der Wasseroberfläche erkennt Mia deutlich die Bäume.
Mia can clearly see the trees in the reflection on the surface of the water.
Die Reflexion des Lichts an der Wasseroberfläche verändert sich mit dem Winkel.
The reflection of the light off the surface of the water changes with the angle.
