Where should an object be placed in front of a convex lens of focal length 0.12 m to obtain a real image of size three times the size of the object, on the screen?

Dear Student,

Kindly ask different queries in different thread. Also, refer the solution of 4th question.
magification, m=vu3=vuv=3uaccording to lens formula,1v-1u=1f13u-1u=10.121-33u=10.12-0.24=3uu=-0.08 m

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