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Figure 16, shows a graph of magnification against object distance, for an object placed in front of a lens of focal length 20 cm.

      

cFigure 16, shows a graph of magnification against object distance, for an object placed in front of a lens of focal length 20 cm.
physics622017822.jpg
Using the graph;
(i) State the effect on the size of the image when the object distance is increased from 25 cm.
(ii) Determine the distance between the object and the lens when the image is same size as the object.
(iii) Determine the image distance when the object distance is 25 cm.

  

Answers


John
(i) The image size decreases.

(ii) When m = I, image size = object size, hence u = 40 cm.

(iii) u = 25cm, m = 3.5 and since m = $\frac{v}{u}$

v = 25 x 3.5 = 87.5 cm.
johnmulu answered the question on June 2, 2017 at 05:24


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