ฉันต้องใช้ภาษาอังกฤษถูกหลักไวยากรณ์
Light is an electromagnetic wave with a frequency of approximately from Hz to 400 Hz or a wavelength range of 700 nm, the human eye is very sensitive to the electromagnetic waves. Objects with a very high temperature, such as incandescent light bulb with a high temperature of about 2500 ° C sun at a temperature of about 6000 degrees Celsius to emit light. For light with a wavelength of about 700 nm retinopathy is recognized as a red light. The light at a wavelength less. The optic nerve is perceived as orange, yellow, green, blue or violet light, respectively. Which has a wavelength of about 400 nm in the light of these. When combined with the right amount. A white light