Question

why is a concave lens called diverging lens​

Answer 1

Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge).A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.

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Answer 2

Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge).A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.