What would happen to the spread of colors in the spectrum if a second identical prism is placed after the first in an inverted position?

Question

What would happen to the spread of colors in the spectrum if a second identical prism is placed after the first in an inverted position? — Exam MCQ

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C. The spread of colors recombines to form white light — The correct choice is The spread of colors recombines to form white light. It follows from the laws of reflection/refraction and the standard image-formation properties of lenses, mirrors or optical systems.

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A. The colors spread further apart

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B. The spectrum shifts to one side

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D. Only red and violet merge

What would happen to the spread of colors in the spectrum if a second identical prism is placed after the first in an inverted position?

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