Question

For a concave mirror, if virtual image is formed, the graph between $m$ and $u$ is of the form

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

In concave mirror, if virtual images are formed, $u$ can have values zero and $f$
At $u=0,m=\frac{f}{f-u}=\frac{f}{f}=1$
At $u=f,m=\frac{f}{f-u}=-\frac{f}{-f-(-f)}=\infty$