可か視し光こう望ぼう遠えん鏡きょうMeanings1nounoptical telescopeA telescope that observes visible light, as opposed to radio or infrared telescopes.可か視し光こう望ぼう遠えん鏡きょうで星せい雲うんを観かん測そくする。Observe nebulae with an optical telescope.