For a concave lens of focal length

Question:

For a concave lens of focal length $\mathrm{f}$, the relation between object and image distance $u$ and $v$, respectively, from its pole can best be represented by ( $u=v$ is the reference line):


Correct Option: 4,

Solution:

$v=\frac{u f}{u+f}$

Case-I

If $\quad \mathrm{v}=\mathrm{u}$

$\Rightarrow \mathrm{f}+\mathrm{u}=\mathrm{f}$

$\Rightarrow \mathrm{u}=0$

Case-II

If $u=\infty$

then $v=f$

Only option (4) satisfies this condition.

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Comments

DA
Sept. 17, 2023, 6:35 a.m.
Why will it not the graph?
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