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Science · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 1 · Q33
The given figure shows image formation by a lens. Analyse the figure and answer the following questions :
(a)What is the type of lens used for image formation in the given ray diagram ?(b)If the real image is formed at a distance of $\displaystyle 30$ cm from the lens and the size of image is twice the size of the object, then where was the object placed?
The given figure shows image formation by a lens. Analyse the figure and answer the following questions :
(a)
What is the type of lens used for image formation in the given ray diagram ?
(b)
If the real image is formed at a distance of $\displaystyle 30$ cm from the lens and the size of image is twice the size of the object, then where was the object placed?
Marking-scheme solution
(a) Convex lens / Converging lens
(b) \(\displaystyle \mathrm{m}=-2, \mathrm{v}=30 \mathrm{~cm}\)
\[\begin{aligned}
& \mathrm{m}=\frac{v}{u} \\
& u=\frac{v}{m} \\
& u=\frac{30}{-2}
\end{aligned}
\]
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.