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Science · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 1 · Q36
(a) A ray of light after reflection from a concave mirror becomes parallel to its principal axis. Draw a labelled ray diagram to show this. (b) (i)…
(a)
A ray of light after reflection from a concave mirror becomes parallel to its principal axis. Draw a labelled ray diagram to show this.
(b)(i)
Differentiate between the virtual images formed by a convex mirror and concave mirror.
(ii)
"The value of magnification ' $\displaystyle m$ ' for a mirror is -2." Calculate the height of object if the height of image is $\displaystyle 20$ cm.
Marking-scheme solution
(a) (b)
(i)
(i)(ii) \[m=-2
\]
\(\displaystyle m=\frac{\text { height of image }}{\text { height of object }}=\frac{h^{\prime}}{h}\)
\[h=\frac{h^{\prime}}{m}
\]
\(\displaystyle h=\frac{-20}{-2}\)
\(\displaystyle h=10 \mathrm{~cm}\)
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