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  • Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also indicate the order of the colours of the spectrum obtained.

Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also, indicate the order of the colors of the spectrum obtained.

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Explanation:-

When a narrow beam of white light is incident on a prism, the light is refracted at both surfaces of the prism, resulting in the dispersion of light. Dispersion occurs because different colors (wavelengths) of light refract by different amounts due to their varying refractive indices in the material of the prism.

Order of colors from bottom to top: remembering keyword VIBGYOR
V - Violet, I - Indigo, B - Blue, G - Green, Y - Yellow, O - Orange and R - Red.

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