Answer: red
Notes: In refracting media like glass prism, water, etc. , lights of different colors travel with different speeds because of their different wavelengths Cc= f N. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So, the violet colour is deviated the most, while red colour is deviated the least when passing through the prism.
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