Question
Sat February 11, 2012 By:
 

how can we change the focal length of a convex lens (A)by changing position of object (B)changing size of the object (C)changing medium (D)none

Expert Reply
Sat February 11, 2012
(c) changing the medium as the focal length depends on the medium un which it is placed.
Sat September 23, 2017

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