不可視 ふかし光線 こうせん

fukashi kōsen

1. Not invisible light.; Not infrared/ultraviolet light.

1. Was invisible light.

1. Invisible rays

1. Invisible; Non-visible

1. Not invisible rays.; Not infrared/ultraviolet light.

1. Not visible light.; It's not visible light.

1. Was invisible light.

1. Invisible light.

1. Not visible light.; It is not visible light.

1. Wasn't invisible light.; Wasn't infrared/ultraviolet light.

1. Probably invisible rays.; Probably infrared/ultraviolet light.

1. Was not invisible light.; Was not ultraviolet light.

1. Wasn't invisible light.

1. Probably invisible rays.; Probably infrared/ultraviolet light.

1. Was not invisible light.; Was not ultraviolet light.

1. If/when invisible light rays…; If invisible light rays were…

1. If/when invisible rays; If/when invisible light

1. If/when invisible light rays; If/when ultraviolet rays (depending on context)