第3题人的视觉器官有感觉外界物体的光和颜色的功能。可见光的波长范围一般是380nm(纳米)到780 nm,称为可见光谱。在可见光谱内,不同波长的辐射使人感到不同颜色,一般来说,700 nm为红色,580 nm为黄色,510 nm为绿色,470 nm为蓝色,400 mn为紫色。这种现象说明A.人只能认识外界物体作用于感官形成的感觉 The third subject’s visual organs have the function of sensing the light and color of the external objects. The wavelength range of visible light is generally 380 nm (nanometers) to 780 nm, which is called the visible spectrum. In the visible spectrum, different wavelengths of radiation make people feel different colors. In general, 700 nm is red, 580 nm is yellow, 510 nm is green, 470 nm is blue, and 400 mn is purple. This phenomenon shows that A. people can only recognize the effect of external objects on sensory formation