Breakdown of Мы изучаем спектр с помощью призмы, которая преломляет свет.
мы
we
изучать
to study
свет
light
который
which / who / that (relative pronoun)
призма
the prism
спектр
the spectrum
с помощью
with the help of
преломлять
to refract
Questions & Answers about Мы изучаем спектр с помощью призмы, которая преломляет свет.
Why use с помощью призмы instead of just the plain Instrumental case (призмой)?
While the simple Instrumental case (призмой) can express the tool used to perform an action, с помощью (with the help of) is slightly more explicit. In scientific or technical sentences like this one, compound prepositions like с помощью are very common to emphasize the exact method or tool. Since it structurally means 'with the help', the noun that follows must take the Genitive case (призмы).
Could we use при помощи or посредством in this sentence instead?
Both с помощью and при помощи mean 'with the help of' or 'by means of' and are largely interchangeable, though при помощи can sound slightly more formal. You could definitely say при помощи призмы here. However, посредством is highly formal and typically used for abstract methods rather than physical tools, so it would sound overly bureaucratic if applied to a prism.
The word призмы is in the Genitive case. Why is the relative pronoun которая in the Nominative case?
A relative pronoun like который takes its gender and number from the noun it refers back to, but it takes its case from its grammatical role in its own clause. Here, it refers back to the feminine singular noun призмы, making it feminine singular. But in the second clause, the prism is the subject doing the refracting (преломляет свет), so которая must be in the Nominative case.
The verb преломляет (refracts) looks a lot like the word for 'to break'. Are they related?
Yes! Преломлять (to refract) is built from the prefix пре- (often meaning across or a change of state, similar to пере-) and the root -лом-, which you likely recognize from ломать (to break). The prism is literally 'breaking' the light to change its direction. Recognizing these everyday roots makes technical Russian vocabulary much easier to decode.
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