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the phenomena in this picture is dispersion. when a beam of white light travels through a prism it will disperse to its seven unique colours namely violet, Indigo, blue, green, yellow, orange and Red. also known as {VIBGYOR}.
The X is a beam of white light.
The Y part is Triangular Prism.
The Z part is VIBGYOR colours.
Additional information :
- The red colour has the longest wavelength
- The violet colour has the shortest wavelength
Hope this helps you.
Thank you for your question it had helped me to think.
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