collimator

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a small telescope attached to a large telescope to use in setting the line of the larger one
  2. noun optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam

Semantic network

Broader (hypernyms)
telescope

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