nap1 tau3 geng3凹透鏡凹透镜
Jyutpingnap1 tau3 geng3
Yalenāp tau geng
Definition
Concave lens; a diverging lens that disperses light.
neutralother
How it's used
Primarily used in scientific or optical contexts, this term is the standard way to describe lenses that are thinner in the middle than at the edges. It is frequently contrasted with 凸透鏡 when discussing corrective eyewear or basic physics principles. While technical, it is commonly understood by students and adults alike due to its prevalence in school science curricula.
Measure word
faai3塊faiExamples
This concave lens can diverge light rays.
Do you know that glasses for myopia use concave lenses?
Related words
Common phrases
concave lens image formation
Grammar color guide
Noun
Verb
Adjective
Adverb
Pronoun
Classifier
Particle
Connector
Grammar guides
- QuestionsFrom yes or no questions to asking who, what, where, and when. The patterns you need to ask questions naturally in Cantonese.
- ClassifiersCantonese puts a classifier between a number and a noun, and a bare classifier on its own can mean the. Learn the common ones and how to use them.
- ComparisonsHow to say bigger than, the most, the same as, and not as good as. Cantonese uses 過 where Mandarin uses 比, and that catches a lot of learners out.
