第15章光Light原書 p.473–494

• The electromagnetic spectrum is made up of a broad range of frequencies of electromagnetic radiation.• All frequencies of EM radiation travel at the same speed in a vacuum and consist of an electric field and a magnetic field. The types of EM radiation have different frequencies and wavelengths, and different energies and penetrating ability.

・電磁スペクトルは、電磁放射の幅広い振動数の範囲からなる。・電磁放射はどの振動数でも真空中を同じ速さで進み、電場と磁場からなる。電磁放射の種類ごとに振動数と波長が違い、エネルギーと物を通り抜ける力も違う。

• EM radiation travels at different speeds in different media, produces colors on thin films, and can be polarized to oscillate in only one direction.• Calculations can be based on the relationship among the speed, frequency, and wavelength of light, and on the relationship among luminous flux, illuminance, and distance.

・電磁放射は媒質ごとに違う速さで進み、薄膜に色を作り、一つの向きにだけ振動するよう偏らせられる。・光の速さ・振動数・波長の関係、および光束・照度・距離の関係にもとづいて計算ができる。