Breakdown of Учёный меняет направление света посредством этой линзы.
этот
this [f: эта, n: это]
свет
light
учёный
scientist, scholar
менять
to change, to exchange
направление
direction
посредством
by means of
линза
the lens
Questions & Answers about Учёный меняет направление света посредством этой линзы.
How does посредством work in this sentence, and what case does it take?
The formal preposition посредством means "by means of" or "via" and always requires the genitive case. Here, it changes эта линза to the genitive этой линзы. It is highly characteristic of scientific, technical, or formal writing.
Could I just use the instrumental case without a preposition here, like этой линзой?
Yes, you can. Saying меняет направление этой линзой is grammatically correct and means essentially the same thing. Using посредством is a stylistic choice that makes the sentence sound more academic and explicitly highlights the mechanism being used.
Could I use с помощью or при помощи instead of посредством?
Absolutely. С помощью этой линзы or при помощи этой линзы would also mean "by means of this lens" or "with the help of this lens" and both also require the genitive case. Посредством is just the most formal option among these compound prepositions.
Why does the noun учёный have an adjective ending?
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