Rays visible.

Meaning: This means that while light rays are not always visible to the naked eye, they can be seen in certain situations. It's like saying, Light rays can sometimes be seen when they pass through dust or fog.

Choice of Words: Rays refers to the straight lines that light travels along. Visible means able to be seen. In this context, 'Rays visible' means that the light rays can be seen under certain conditions, such as when they pass through dust or fog.

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Related Expressions