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Two identical point particle A and B are...

Two identical point particle A and B are placed infront of a concave mirror of focal length 20 cm at distances 10 cm and 30 cm respectively. The particles oscillate perpendicular to the principal axis, such that the displacement equation for both the particles is given by `Y_(A)=Y_(B)=0.1 sin (pit)` cm. Find the maximum separation between the images of A and B measured perpendicular to the principal axis in mm.

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