Learn Croatian: Svjetlost se, naime, prelama zbog gustoće. - Light, you see, bends due to density.

While naime often appears at the very beginning of a sentence, it can also act as a parenthetical aside, set off by commas. Because se is a strict second-position enclitic, it must attach directly to the first word (Svjetlost). The parenthetical naime is inserted only after the enclitic has safely taken its required spot.

How does naime give the meaning of "you see" in this sentence?

As an explanatory discourse marker, naime introduces a reason, cause, or clarification for whatever was just stated in the previous conversation. Translating it as "you see", "namely", or "in fact" captures this exact explanatory tone perfectly in English.

Why is the reflexive pronoun se used with the verb prelama?

The base verb prelamati means to break or fold something else. By adding the reflexive se, it becomes prelamati se, which is used in science to mean "to refract" or "to bend". Since the light is bending naturally on its own rather than breaking another object, the reflexive form is required.

Why does the word for density appear as gustoće?

The preposition zbog (due to / because of) always requires the genitive case. The dictionary form of the noun is gustoća (a regular feminine noun ending in -a). In the genitive case, that final -a changes to an -e, resulting in gustoće.