question_answer

A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at [JIPMER 2002]

A)            Infinity

B)            Focus

C)            Pole

D)            15 cm behind the mirror

Correct Answer: D

Solution :

                   \[u=-30\,cm,\] \[f=+30\,cm,\] by using mirror formula                    \[\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\Rightarrow \frac{1}{+30}=\frac{1}{v}+\frac{1}{(-30)}\]                    \[v=15\,cm,\] behind the mirror