Answer :

(a) Optical center of the lens is defined as the point which lies on the principal axis through the rays of light passes without any deflection.


(b) Given: focal length of convex lens = 20 cm


Height of object = 4cm


Applying the lens formula:






Therefore u=-20 cm


Height of image can be calculated by using the formula:



Therefore,


(b)The ray diagram is as follows:



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