Kng (light) sī pho-tn̂g (wavelingth) ē-tit hōo ba̍k-tsiu (eye) khuànn--tio̍h ê tiān-tsû-pho (electromagnetic radiation), khiā kóng khuànn-ū-kng (visible light). Ah nā ki-su̍t-ti̍k (tetsnical) iah sī kho-ha̍k kóng ê kng, tō pau-hâm tshìn-tshái pho-tn̂g ê tiān-tsû-pho.
Kng ū sann tsióng ki-pún sìng-tsit:
- kiông-tōo (intensity), iah sī pho-hok (amplitude), kap lán kám-kak--tio̍h ê kng-tōo (brightness) ū tī-tāi,
- pîn-lu̍t (frequency), iah sī pho-tn̂g, lán khuànn--tio̍h ê sik (color),
- phian-kng (polarization), tō sī tsùn-tāng ê kak-tōo (angle of vibration), phóo-thong khuân-kíng sió-khuá ē-sái kám-kak--tio̍h ê Haidinger ê uē-pit (Haidinger's brush) tsit ê hiān-siōng.
Bu̍t-tsit (matter) ū pho-lia̍p jī-guân-sìng (wave-particle duality), kng kâng-sî ū pho kap lia̍p-tsú nn̄g tsióng sìng-tsit tī--leh. Kng ê pún-tsit sī hiān-tāi bu̍t-lí-ha̍k ê tsi̍t ê kuan-kiàn būn-tê.
- Tsit phinn sī uì Hô-ló-pah-kho(Holopedia) ê : "Kng" kái-lâi ê. Guân-pún ê tsok-tsiá tshiánn khuànn i ê pian-tsi̍p li̍k-sú.