CBSE 2024 · Region 1 · Set 1 · Q19 · 2 marks
An object is placed $\displaystyle 30$ cm in front of a concave mirror of radius of curvature $\displaystyle 40$ cm . Find the (i) position of the image formed and(ii)magnification of the image.
An object is placed $\displaystyle 30$ cm in front of a concave mirror of radius of curvature $\displaystyle 40$ cm . Find the (i) position of the image formed and
(ii)
magnification of the image.
Marking-scheme solution
\[\begin{aligned}
& \text { (i) } \frac{1}{\mathrm{v}}+\frac{1}{u}=\frac{1}{f} \\
& \frac{1}{\mathrm{v}}+\frac{1}{-30}=\frac{1}{-20}
\end{aligned}
\]
On solving
\[\mathrm{v}=-60 \mathrm{~cm}
\]
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.