Murdumisteguritavamõõtur töötab kriitilise nurga põhimõttel, mille abil läätsed ja prismad projitseerivad varjujoone mõõtevahendi sees olevale väikesele klaasvõrkkestale, mida kasutaja seejärel luubi kaudu vaatab.
A traditional handheld refractometer works on the critical angle principle by which lenses and prisms project a shadow line onto a small glass reticle inside the instrument, which is then viewed by the user through a magnifying eyepiece.
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