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PHYSICS CH6 Light — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9SciencePHYSICS CH6 Light2 Marks
Question
Numerical problem.

A concave mirror produces three times magnified real image of an object placed at 7 cm in front of it. Where is the image located? (Ans: 21 cm in front of the mirror)

✓

Answer

Given: hi = 3ho
u = 7 cm
Solution:
  1. $m =\frac{ h _{ i }}{ h _{ O }} \Rightarrow \frac{3 h _{ o }}{ h _{ O }} \therefore m =3$
  2. $\begin{aligned} & m =-\frac{v}{u} \\ & v =- m \times u \\ & =-3 \times 7 cm =-21 cm .\end{aligned}$
    Hence, Real, inverted and magnified image will be formed at 21 cm in front of the mirror.

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