What do you understand by the focus of a lens ？How will you find of a convex lens？
vivekanand5:
power of lens is a reciprocal of focal lenth in meter
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Concave Lens. ... 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.
when reflected rays are pointed at a point the point is called focus
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