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?

  • $\begingroup$ What do you mean by “graphical method”? $\endgroup$ – Farcher Apr 29 '19 at 17:40
  • $\begingroup$ @Farcher finding the focal length by drawing a graph for different u and v values we obtain experimentally $\endgroup$ – AfiJaabb Apr 30 '19 at 11:19

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

  • $\begingroup$ So I should move the pin towards my eye right? $\endgroup$ – AfiJaabb May 2 '19 at 8:51

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