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Science · 2025 · 2 marks
CBSE 2025 · Region 5 · Set 3 · Q21
During an experiment, a student observes that the given mirror is forming an erect and diminished image for all positions of the object placed in…
During an experiment, a student observes that the given mirror is forming an erect and diminished image for all positions of the object placed in front of it. Based on the this information, answer the following questions :
(a)
Identify the mirror.
(b)
Using new Cartesian sign convention, write the magnitude of the magnification in this case.
(c)
What will be the radius of curvature of the mirror if its focal length is $\displaystyle 20$ cm ?
Marking-scheme solution
(a)
Convex mirror
(b)
Positive and less than $\displaystyle 1$
(c)
+$\displaystyle 40$ cm or $\displaystyle 40$ cm
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.