JEE Advanced 2022 Paper 1 Q4

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



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