
die Linse
lentil
The edible, flat seed of a legume, often used for soups and stews.
An kalten Tagen koche ich gerne eine wärmende Linsensuppe.
On cold days, I like to cook a warming lentil soup.
lentil / lens
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lentil
The edible, flat seed of a legume, often used for soups and stews.
An kalten Tagen koche ich gerne eine wärmende Linsensuppe.
On cold days, I like to cook a warming lentil soup.

lens
A transparent component, usually made of glass or plastic, with at least one curved surface, that focuses or scatters rays of light. It is used in glasses, cameras, or telescopes.
Der Fotograf hat die Linse seines Objektivs sorgfältig geputzt.
The photographer carefully cleaned the lens of his camera.

lens
The transparent, elastic body inside the eye that refracts light and focuses it on the retina.
Bei der Operation des Grauen Stars wird die getrübte körpereigene Linse durch eine künstliche ersetzt.
During cataract surgery, the clouded natural lens is replaced with an artificial one.
Since 'Linse' (lentil/lens) has three very different meanings, context is crucial. If it is about cooking and food, it refers to the legume. In connection with cameras, glasses, or optics, it refers to the optical component. If people are talking about the eye or medicine, it refers to the part of the eye.
Für dieses Rezept brauchen Sie rote Linsen.
You need red lentils for this recipe.
In a culinary context, 'Linse' (lentil) is often combined with dishes or preparation methods. Typical examples are 'Linsensuppe' (lentil soup), 'Linseneintopf' (lentil stew), or color descriptions such as 'rote Linsen' (red lentils) or 'braune Linsen' (brown lentils).
Im Winter esse ich gerne einen heißen Linseneintopf.
In winter, I like eating a hot lentil stew.
When it comes to optics, 'Linse' (lens) often appears in connection with devices. Common combinations are 'die Linse der Kamera' (the camera lens), 'die Linse des Objektivs' (the lens of the camera lens), or 'eine konvexe/konkave Linse' (a convex/concave lens).
Pass auf, dass kein Staub auf die Kameralinse kommt.
Be careful that no dust gets on the camera lens.
In anatomy and medicine, it almost always means 'die Linse des Auges' (the lens of the eye). You also often hear about a 'künstliche Linse' (artificial lens), which is inserted during operations.
Der Arzt erklärte, wie die Linse im Auge funktioniert.
The doctor explained how the lens in the eye works.
glass / jar
The given meanings of “das Glas” and “die Linse” do not support the stated area of possible confusion in optics. Therefore, these meanings do not allow a precise distinction in usage for a part of a pair of glasses.

Für die Suppe weicht sie die Linse über Nacht ein.
She soaked the lentil overnight for the soup.
Das Glas steht neben dem Teller.
The glass is next to the plate.