A horizontal parallel beam of light passes through a vertical convex lens of focal length f. The

A horizontal parallel beam of light passes through a vertical convex lens of focal length f. The optical centre of the lens is P. A small plane mirror is placed at point M inclined at `60�` to the axis of the lens. Distance `PM = f//2`. The mirror reflects the light passing through the lens and forms an image at point I. Find distance PI.

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