how to find out whether a lens is concave or convex without focal length and with the power mentioned?
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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.
unicornrush046:
thank you
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