If instead of sunlight, a green-coloured ray is passed through a glass prism, the colour of the emergent ray would be D. Green light
How to find the light ?
A prism works by refracting light, meaning it bends the light rays as they pass through.
The amount of bending depends on the wavelength of the light. Shorter wavelengths (blue and violet) bend the most, while longer wavelengths (red) bend the least. Green light falls in the middle of the visible spectrum.
However, green light is already a single color with a specific wavelength. When it passes through the prism, it will be refracted at a specific angle based on its wavelength, but it will not separate into other colors. Therefore, the emergent ray will remain green.