Question

Is that true the colour having high wavelength and small refractive inder. Which colour have high reflective index

Answer 1

voilet because it's frequency is large speed is less so referactive index is high

Answer 2

Yes it is right. As red colour is having the longest wavelength as compared to all seven other colours, therefore it will have the lowest reflective index.
Whereas, voilet colour has the least wavelength, therefore it will have the highest reflective index.

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