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

Asked by  | 11th Feb, 2012, 05:58: PM

Expert Answer:

(c) changing the medium as the focal length depends on the medium un which it is placed.

Answered by  | 11th Feb, 2012, 06:16: PM

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