What are conjugate foci ?
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The sets of points on the principal axis of a lens where the position of the object and the image canbe interchanged are called conjugate foci
two points so related to a lens or concave mirror that an image at one point is focused at the other, and vice versa.this penominon are called conjugate foci
By Newton formula Fsquare=(V-F)(U-F)Set of point on principle axis of concave mirror or a lens which can be interchangeable is state as conjugate focii 2
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