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A horizontal parallel beam of light pass...

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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The correct Answer is:
`f//2`
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