Path to the gold, so they say

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Possible Answers:

RAINBOW.

Last seen on: –LA Times Crossword 24 Sep 20, Thursday
The Washington Post Crossword – Sep 24 2020

Random information on the term “RAINBOW”:

Atmospheric optics is “the study of the optical characteristics of the atmosphere or products of atmospheric processes …. [including] temporal and spatial resolutions beyond those discernible with the naked eye”. Meteorological optics is “that part of atmospheric optics concerned with the study of patterns observable with the naked eye”. Nevertheless, the two terms are sometimes used interchangeably.

Meteorological optical phenomena, as described in this article, are concerned with how the optical properties of Earth’s atmosphere cause a wide range of optical phenomena and visual perception phenomena.

Examples of meteorological phenomena include:

Other phenomena that are remarkable because they are forms of visual illusions include:

A book on meteorological optics was published in the sixteenth century, but there have been numerous books on the subject since about 1950. The topic was popularised by the wide circulation of a book by Marcel Minnaert, Light and Color in the Open Air, in 1954.

RAINBOW on Wikipedia