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Take any one convex lens and find its rough focal length.
Take a plane mirror and place it on the horizontal base of the iron stand.
Place the convex lens on the plane mirror.
Screw tight the optical needle in the clamp of the stand and hold it horizontally above the lens at distance equal to its rough focal length.
Bring the tip of the needle at the vertical principal axis of the lens, so that tip of the needle appears touching the tip of its image.
Move the needle up and down and remove parallax between tips of the needle and its image.
Measure distance between tip and upper surface of the lens by using a plumb line and half metre scale.
Also measure distance between tip and the surface of its plane mirror.


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