Question : Which of these travels in glass with minimum velocity?
Option 1: Red light
Option 2: Violet light
Option 3: Green light
Option 4: Yellow light
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Correct Answer: Violet light
Solution : The correct option is Violet light .
Violet light, with the shortest wavelength in the visible spectrum, traverses glass at a slower velocity compared to other lights. The speed of light in a substance, like glass, depends on the wavelength, or colour. In glass, shorter wavelengths (violet and blue) move more slowly than longer ones (red, yellow, and green), a phenomenon known as dispersion. Dispersion in a prism leads to the separation of white light into its constituent colours due to varying refractive indices, producing a rainbow effect.
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