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Displacement Method

By this method, focal length of convex lens is determined. Consider an object and a screen placed at a distance D (> 4f) apart (Fig. 23). Let a lens of focal length f be placed between the object and the screen.
Fig. 23
  • For two different positions of lens two images (I1 and I2) of an object are formed at the screen.
  • Focal length of the lens, 113403.png where 113409.png, 113415.png and m1m2 = 1.
  • Size of object 113431.png

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