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Answer:

negative.

explaination:

The focal distance of a concave lens is always negative due to the nature of how concave lenses function. Concave lenses diverge light rays that are incident upon them, which means that they spread out the light rather than converging it. This divergence results in the formation of a virtual image that appears to be located on the same side of the lens as the object. In optics, the convention is that the focal length of a lens is considered positive if it converges light (like a convex lens) and negative if it diverges light (like a concave lens). Therefore, for concave lenses, the focal distance is always negative.

Topic: Optics, Lenses, Concave Lens Properties

Tags: optics lenses concave lens focal distance light

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Focal distance of a concave lens is always:

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