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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 2 · Q30
(a) The image of an object formed by a lens is of same size but inverted. If the object distance is 30 cm, calculate (i) The distance between the…
(a)
The image of an object formed by a lens is of same size but inverted. If the object distance is $\displaystyle 30$ cm, calculate
(i)
The distance between the object and its image.
(ii)
Focal length of the lens.
(b)
Draw a ray diagram to show the image formed in above case.
Marking-scheme solution
(i) As the image is of same size
∴ Object distance \(\displaystyle =2 \mathrm{~F}=30 \mathrm{~cm}\)
∴ The image will be formed on the right side of lens at 2F' = $\displaystyle 30$ cm
The distance between the object and its image \(\displaystyle =60 \mathrm{~cm}\)(ii) \(\displaystyle \mathrm{f}=15 \mathrm{~cm}\)
(iii) 
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.