Grade 10 Optics Practice Test

The correct order of the seven colors of the visible spectrum, from weakest to strongest in terms of energy, is red, orange, yellow, green, blue, indigo, and violet.

In the context of light, colors correspond to different wavelengths, with red having the longest wavelength and the lowest energy, while violet has the shortest wavelength and the highest energy. This sequence aligns with the typical representation of the visible spectrum, often remembered by the acronym ROYGBIV.

The energies of light waves increase as the wavelength decreases: red light (around 620-750 nm) is the least energetic, followed by orange, yellow, green, blue, indigo, and finally violet (around 380-450 nm) as the most energetic. Understanding this ordering is crucial in topics related to optics, as it informs us about how different colors behave, such as their ability to refract or disperse.