MCQ
For a concave mirror, if virtual image is formed, the graph between $m$ and $u$ is of the form
- A
- ✓
- C
- D
✓
Answer
Correct option: B.
In concave mirror, if virtual images are formed, $u$ can have values zero and $f$
At $u=0, \quad m=\frac{f}{f-u}=\frac{f}{f}=1$
At $u=f, \quad m=\frac{f}{f-u}=-\frac{f}{-f-(-f)}=\infty$
At $u=0, \quad m=\frac{f}{f-u}=\frac{f}{f}=1$
At $u=f, \quad m=\frac{f}{f-u}=-\frac{f}{-f-(-f)}=\infty$
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