[Physics] Determining the focal length of a convex lens (no-parallax method)

experimental-physicslensesoptics

This is about the experiment where we determine the focal length of a convex lens using the graphical method,(the no parallax method).
In the situation where the image moves opposite to the direction that I move my eye,do I have to move the observation pin towards my eye or away from my eye?

Best Answer

In the method of no-parallax you need to have the image of the object pin in the same position (position of no parallax) as the observation pin.

I hope that the diagram below is self explanatory?

enter image description here

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