Solve the all parts of given question:
Question: An object is located 1.4 m from a 6.5-D lens.
Part I: By how much does the image move if the object is moved0.7 m closer to the lens? Follow the sign conventions.
Part II: By how much does the image move if the object is moved0.7 m farther from the lens? Follow the sign conventions.
I don't understand how to get the answer. Can you please help me with this question?