Antirefleksbehandlingen er på brilleglassene.

Because Danish, like English, often builds nouns as compounds, but Danish usually writes them as a single word.

Antirefleksbehandlingen can be broken down like this:

• anti = anti-
• refleks = reflection / glare
• behandling = treatment
• -en = the

So the whole word means the anti-reflective treatment/coating.

It is the definite article attached to the end of the noun. In English, you say the before the noun. In Danish, you often add it to the noun instead.

So:

• en antirefleksbehandling = an anti-reflective treatment
• antirefleksbehandlingen = the anti-reflective treatment

This is very common in Danish.

For the same reason: the definiteness is built into the noun itself.

Brilleglassene already means the lenses.

Here the ending -ene marks definite plural. So:

• brilleglas = lens / lenses depending on context
• brilleglassene = the lenses

English uses a separate article, but Danish often uses an ending instead.

It is made up of:

• brille = glasses / spectacles
• glas = glass, lens
• -ene = the for plural nouns

So brilleglassene means the eyeglass lenses or simply the lenses.

A useful thing to notice is that compounds often use a base form like brille- even if English would use a different structure.

På means on here, and it is used because the anti-reflective coating is thought of as being on the surface of the lenses.

So er på brilleglassene means is on the lenses.

That is a very natural choice with something like a coating, layer, or treatment on a surface.

Literally, behandling means treatment. But in contexts like glasses, lenses, or surfaces, it can refer to a special surface treatment, which English often translates more naturally as coating.

So the Danish word is a bit broader, while the English translation may choose the more specific word that sounds best in context.

Er is the present tense of at være, which means to be.

So here it means is.

A useful thing for English speakers is that Danish does not change this verb in the present tense depending on the subject:

• jeg er = I am
• du er = you are
• han er = he is
• de er = they are

So er can correspond to am, is, or are in English.

Yes. This is a normal Danish statement:

• Antirefleksbehandlingen = subject
• er = verb
• på brilleglassene = prepositional phrase

So it follows the expected pattern of subject + verb + other information.

It is a very straightforward sentence.

Because in modern Danish, common nouns are not normally capitalized.

Antirefleksbehandlingen is capitalized here only because it is the first word of the sentence.

So unlike German, Danish does not capitalize every noun.