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the image  of an object placed 36 cm from a shpericl lens is formed on a screen at a distace of 72 cm from lens Find its f?
Will v=72 or v= -72  why

Asked by P S Lakshmi 4th March 2015, 2:39 PM
Answered by Expert
Answer:
Given that:
Object distance, u = -36 cm ;
Image distance, v = 72 (image formed is real so taken as positive)
Focal length, f = ?
Substituting these values in the mirror formula we get:
begin mathsize 12px style 1 over straight f space equals space 1 over straight v space minus space 1 over straight u space space space space space space equals space 1 over 72 space minus space fraction numerator 1 over denominator left parenthesis negative 36 right parenthesis end fraction space equals space 3 over 72 1 over straight f space equals space 1 over 24 straight f space equals space 24 space cm end style
Thus, the focal length of the lens is 24 cm.
Answered by Expert 11th December 2017, 7:13 PM
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