A narrow beam of white light produces a spectrum of all colors (VIBGYOR) XY on passing through a triangular glass prism.

The color which bends the most, $X$ , is [[1]], and the color which bests the least, $Y$ , is [[2]].

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Detailed Solution

The color at

X

is violet, and

Y

is red.
When refracted from a prism, the light gets dispersed into seven colors. These seven colors are VIBGYOR.
The color at

Y

is Red because it has the shortest wavelength of all the colors. This means that it bends the least in light waves and appears reddish.
The colour at

X

is violet because it bends the most because its electromagnetic radiation falls within the longer-wavelength part of the visible spectrum.
Therefore, the color at

Y

is Red and at

X

is Violet.

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