Question 12:- 12. While performing Experiments with the Optical-bench in Physics Lab, it is always preferred to place object needle & image needle at a distance 4 times the focal length of the lens apart. Vivaan wants to place a book in front of a convex lens to get its image on the wall 3m from the book. In this particular case, suggest the possible focal length of the lens used by him to get the image on required location.
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well he needs abcinvex lens of suitable focal length
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