多级标题：
I. Introduction
II. The concept of wavelength
III. The visible spectrum
A. Definition
B. Colors in the visible spectrum
IV. Determining the longest wavelength visible to the human eye
V. Conclusion
I. Introduction
– Briefly introduce the topic of calculating the longest wavelength visible to the human eye.
– Explain the importance of understanding the visible spectrum and how it relates to our perception of color.
II. The concept of wavelength
– Define wavelength as the distance between two corresponding points on a wave.
– Discuss how wavelength is measured in various units, such as meters or nanometers.
– Explain the relationship between wavelength and the color of light.
III. The visible spectrum
A. Definition
– Define the visible spectrum as the range of wavelengths that can be detected by the human eye.
– Explain that the visible spectrum represents only a small portion of the entire electromagnetic spectrum.
B. Colors in the visible spectrum
– Describe how different wavelengths in the visible spectrum correspond to different colors.
– Mention the order of colors in the visible spectrum: red, orange, yellow, green, blue, indigo, and violet.
– Explain that each color has a specific range of wavelengths associated with it.
IV. Determining the longest wavelength visible to the human eye
– Discuss how the human eye perceives light and how it detects different wavelengths.
– Explain that the longest wavelength visible to the human eye is at the red end of the visible spectrum, specifically around 700 nanometers.
– Mention that wavelengths longer than 700 nanometers are not detectable by the human eye and are considered infrared radiation.
V. Conclusion
– Recap the main points discussed in the article.
– Emphasize the significance of understanding the longest wavelength visible to the human eye in the context of color perception.
– Conclude by highlighting the importance of further research in the field of human vision and the visible spectrum.
