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Science · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 3 · Q35
(a) Write the name of the lens and position of the object in front of it so that a virtual and magnified image is formed. (b) An object is placed…
(a)
Write the name of the lens and position of the object in front of it so that a virtual and magnified image is formed.
(b)
An object is placed perpendicular to the principal axis of a convex lens of focal length $\displaystyle 20$ cm. If object is located at $\displaystyle 30$ cm from this lens, using lens formula find out the position and nature of the image formed.
Marking-scheme solution
(a)
Convex lens
When object is placed between focus and optical centre
(b)
\(\displaystyle \mathrm{f}=+20 \mathrm{~cm} \mathrm{u}=-30 \mathrm{~cm}\)
\[\begin{aligned}
& \frac{1}{v}-\frac{1}{u}=\frac{1}{f} \\
& \frac{1}{v}=\frac{1}{f}+\frac{1}{u} \\
& \frac{1}{v}=\frac{1}{20}+\frac{1}{-30} \\
& \frac{1}{v}=\frac{1}{60} \\
& v=60 \mathrm{~cm}
\end{aligned}
\]
The image is formed at a distance of $\displaystyle 60$ cm on the other side of the optical centre.
Nature of image - Real, inverted
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.