91Ó°ÊÓ

The visible spectrum is a range of colors that human eyes can perceive. It includes all the colors we see every day, from rich reds to deep violets. When you observe a rainbow, you are witnessing the visible spectrum. A rainbow occurs because sunlight is split into its constituent colors, demonstrating how white light is a combination of all these colors. This splitting happens because different colors (or wavelengths) of light travel at different speeds through water droplets in the atmosphere, causing them to bend and separate. To summarize, the visible spectrum includes:

• Red
• Orange
• Yellow
• Green
• Blue
• Indigo
• Violet

Each color corresponds to a specific wavelength of light, creating the beautiful array we can detect with our eyes.

Sunlight is one of the most familiar sources of white light in our environment. It is essential for life on Earth and plays a crucial role in maintaining our ecosystem. When sunlight reaches Earth, it appears as white light because it contains all the colors of the visible spectrum. Sunlight composition:

• Visible light: This is the light we can see, making up around 44% of sunlight.
• Infrared light: Though not visible to us, it is responsible for the warmth we feel from the sun.
• Ultraviolet light: Invisible as well; it can have effects such as causing sunburn.

While standing outside on a sunny day, sunlight enters our atmosphere, and through scattering and reflection, we experience white light that illuminates everything around us. Whether it’s helping plants photosynthesize or allowing us to see the world in vibrant color, sunlight is a pivotal source of white light.

Wavelengths of light refer to the distance between consecutive peaks of the light waves. Different colors have different wavelengths, which determine the color we perceive. The visible spectrum contains wavelengths approximately between 380 nm (nanometers) for violet and 750 nm for red. Each wavelength carries a different color:

• Violet light has the shortest wavelength.
• Red light has the longest wavelength within the visible spectrum.

The sequence of colors in the visible spectrum is often referred to by the acronym ROYGBIV, representing red, orange, yellow, green, blue, indigo, and violet. Importance of Wavelengths:

• They affect how light behaves as it travels through different mediums, like air or water.
• Different wavelengths are absorbed or reflected by materials, giving objects their color.

Understanding these wavelengths helps us in diverse fields, from creating efficient optical devices to enhancing art with precise lighting.