Answer
The object distance (p) = +120 cm
Work Step by Step
The object distance(p) is
$p = f(1-1/m)\\\\
p = (-30)(1-1/0.20)\\\\
p = +120 cm$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.