Lysmåleren viser riktig eksponering.

Because Norwegian usually writes compound nouns as a single word.

So:

• lys = light
• måler = meter / measurer

Together, lysmåler means light meter.

Then -en is added for the definite form, giving lysmåleren = the light meter.

This is very normal in Norwegian. English often uses two words where Norwegian uses one.

The ending -en marks the definite singular form of many masculine/common-gender nouns in Bokmål.

Here the base noun is:

• en lysmåler = a light meter

Definite form:

• lysmåleren = the light meter

So the sentence is talking about the light meter, not just any light meter.

Lysmåler is a common-gender noun in Bokmål.

Its forms are:

• en lysmåler = a light meter
• lysmåleren = the light meter
• lysmålere = light meters
• lysmålerne = the light meters

For an English speaker, the main thing to notice is that Norwegian nouns have grammatical gender, and that affects articles and endings.

Viser is the present tense of å vise = to show.

So:

• å vise = to show
• viser = shows / is showing

In this sentence, viser means shows or is showing, depending on context.

Because Norwegian often uses the simple present where English might use either shows or is showing.

So:

• Lysmåleren viser riktig eksponering.

can mean:

• The light meter shows correct exposure
• The light meter is showing correct exposure

The Norwegian present tense is often broader than the English simple present.

Because eksponering is a common-gender singular noun here, and with an indefinite singular common-gender noun, the adjective usually has no extra ending.

So:

• riktig eksponering = correct exposure

Compare:

• en riktig eksponering = a correct exposure
• et riktig bilde = a correct/right image → neuter noun, so riktig gets -t
• riktige bilder = correct images → plural, so riktige

In your sentence, eksponering is common gender and singular, so riktig is the expected form.

Because eksponering is being used in a more general/abstract technical sense, like English correct exposure rather than a correct exposure.

In photography language, this is very natural. The sentence is talking about the exposure value/condition, not counting one individual item.

So:

• riktig eksponering = correct exposure

If you made it more specific, you could use an article, but here the bare noun sounds natural.

Eksponering is normally a common-gender noun in Bokmål.

Typical forms:

• en eksponering = an exposure
• eksponeringen = the exposure

That helps explain why the adjective appears as riktig rather than a neuter form.

It follows the normal Norwegian main-clause pattern:

• Lysmåleren = subject
• viser = verb
• riktig eksponering = object

So the structure is:

Subject + Verb + Object

This is the same basic order as in ordinary English statements:

• The light meter shows correct exposure.

In a yes/no question, Norwegian normally puts the verb first:

• Viser lysmåleren riktig eksponering?

That means:

• Is the light meter showing correct exposure?
• Does the light meter show correct exposure?

So the statement:

• Lysmåleren viser riktig eksponering.

becomes the question:

• Viser lysmåleren riktig eksponering?

Because den riktige eksponeringen means the correct exposure in a more specific, definite sense.

Compare:

• riktig eksponering = correct exposure, as a general condition or value
• den riktige eksponeringen = the correct exposure, a particular one

In a technical statement about what a meter indicates, the less specific phrase riktig eksponering is more natural.

No. Riktig is very broad and often means:

• correct
• right
• proper

In this sentence, it means correct in a technical sense: the exposure is at the correct level.

So riktig can be used for factual, practical, or technical correctness, not just moral rightness.