--- title: A lens is a piece of clear glass or plastic with curved sides that b… — Lenses and eyes · tree and pragmatics description: A lens is a piece of clear glass or plastic with curved sides that bends light on its way through; a lens thick in the middle gathers the light inwards. Who acts: lens, piece. A sentence of the lesson «Lenses and eyes» of the physics course of Mova's primary school with its dependency tree and the p --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/22-lenses-and-eyes/0/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/) / [Lenses and eyes](https://md.mova.elamur.ai/free/en/corpora/school/physics/22-lenses-and-eyes/) / 0 # Lenses and eyes, sentence 0 A lens is a piece of clear glass or plastic with curved sides that bends light on its way through; a lens thick in the middle gathers the light inwards. **Who acts:** lens, piece · **What happens:** be, curve, bend, gather · **To what, where:** piece, light, way This is a sentence of the lesson «Lenses and eyes» of the physics course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (lens, piece), what happens, when and where, as Mova's frames read it from the tree. ## The tree {#tree} ```conllu # sent_id = school:physics:022-lenses-and-eyes.lesson:0 # text = A lens is a piece of clear glass or plastic with curved sides that bends light on its way through; a lens thick in the middle gathers the light inwards. # source = school lesson (ours) # course = physics # lesson = 022-lenses-and-eyes.lesson # annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1 1 A a DET DT Definite=Ind|PronType=Art 2 det _ _ 2 lens lens NOUN NN Number=Sing 5 nsubj _ _ 3 is be AUX VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 5 cop _ _ 4 a a DET DT Definite=Ind|PronType=Art 5 det _ _ 5 piece piece NOUN NN Number=Sing 0 root _ _ 6 of of ADP IN _ 8 case _ _ 7 clear clear ADJ JJ Degree=Pos 8 amod _ _ 8 glass glass NOUN NN Number=Sing 5 nmod _ _ 9 or or CCONJ CC _ 10 cc _ _ 10 plastic plastic NOUN NN Number=Sing 8 conj _ _ 11 with with ADP IN _ 13 case _ _ 12 curved curve VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 13 amod _ _ 13 sides side NOUN NNS Number=Plur 8 nmod _ _ 14 that that PRON WDT PronType=Rel 15 nsubj _ _ 15 bends bend VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 5 acl:relcl _ _ 16 light light NOUN NN Number=Sing 15 obj _ _ 17 on on ADP IN _ 19 case _ _ 18 its its PRON PRP$ Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs 19 nmod:poss _ _ 19 way way NOUN NN Number=Sing 15 obl _ _ 20 through through ADP IN _ 19 nmod _ _ 21 ; ; PUNCT : _ 28 punct _ _ 22 a a DET DT Definite=Ind|PronType=Art 23 det _ _ 23 lens lens NOUN NN Number=Sing 28 nsubj _ _ 24 thick thick ADJ JJ Degree=Pos 23 amod _ _ 25 in in ADP IN _ 27 case _ _ 26 the the DET DT Definite=Def|PronType=Art 27 det _ _ 27 middle middle NOUN NN Number=Sing 24 obl _ _ 28 gathers gather VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 5 parataxis _ _ 29 the the DET DT Definite=Def|PronType=Art 30 det _ _ 30 light light NOUN NN Number=Sing 28 obj _ _ 31 inwards inwards ADV RB _ 28 advmod _ Agree=R5-strong|Haiku=24:advmod 32 . . PUNCT . _ 5 punct _ _ ``` ## Pragmatics {#pragmatics} No stored speech act for this sentence. | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **is a** | present | a lens | a piece | | | | of clear glass with curved sides or plastic | tree rules | | 2 | **curve** | participle | | | | | | | vn knead-26.5 «NP.material V PP.product»: agent=Material | | 3 | **bend** | present | a piece | light | | lens's way | | | vn spatial\_configuration-47.6-1 «NP V NP.theme PP»: agent=Agent light=Theme on way=Location | | 4 | **gather** | present | a lens | the light | | | | inwards *property* | vn deduce-97.2 «NP V NP»: agent=Agent light=Theme | One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree. **Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:physics:022-lenses-and-eyes.lesson:0`. **The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence. See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/). - ← previous: [Mirrors, rainbows and the blue sky, 16](https://md.mova.elamur.ai/free/en/corpora/school/physics/21-mirrors-rainbows-and-the-blue-sky/16/) - next →: [Lenses and eyes, 1](https://md.mova.elamur.ai/free/en/corpora/school/physics/22-lenses-and-eyes/1/) - ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/physics/22-lenses-and-eyes/)