Q. 165.0( 2 Votes )

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Answer :

(i) Given: object is placed at 8cm.


Real image is formed at 92 cm mark.


Therefore, object distance u=-42 cm


Applying the lens formula:





f=+21 cm


(ii) Focal length of lens f =+21 cm


Object distance u = -21 cm


Applying the lens formula:







v=infinity


(iii) If the object is further shifted towards the lens, the image formed will be virtual, erect and magnified.



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