Question

define focal lenght of concave lens​

Answer 1

Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.

Answer 2

AnSwEr

Focal length is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.

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Hope it helps. Mark brainliest ✌️