Answer:
(i) u (ii) Object distance = Image distance = 30 cm. When the object moves away from the plane mirror by 15 cm, the new object distance becomes \[30+15=45\text{ }cm\]\[\Rightarrow \]The new image distance \[=45\text{ }cm.\] Therefore, the new distance between object and image is equal to\[45+45=90\text{ }cm\]
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