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A rod of length 2cm makes an angle of 2pi/3 rad with the principle axis of a thin convex lens. The lens has a focal length of 10cm and is placed at a distance 40/3cm from the object as shown in the figure. The height of the image is [30SQRT(pi)]/13 cm. And the angle made by it with respect to the principal axis is (alpha)rad. The value of alpha=pi/n rad. Where n=?

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