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  • Question 4. A point object isplaced at a distance of 20 cmfrom a convex mirror of focallength 20 cm. The image willform at:(a) at infinity(b) at focus(c) at the pole(d) behind the mirror​

Question 4. A point object isplaced at a distance of 20 cmfrom a convex mirror of focallength 20 cm. The image willform at:(a) at infinity(b) at focus(c) at the pole(d) behind the mirror​

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 \begin{aligned} &\text { Given, } f=20 \mathrm{cm}, u=-20 \mathrm{cm}, v=?\\ &\text { As, } \frac{1}{f}=\frac{1}{v}+\frac{1}{u}\\ &\frac{1}{v}=\frac{1}{f}-\frac{1}{u}\\ &\frac{1}{v}=\frac{1}{20}+\frac{1}{20}\\ &\frac{1}{v}=\frac{2}{20}\\ &v=10 \mathrm{cm} \end{aligned}

So, the distance of the image from the pole of the mirror is 10cm.

Ans since v is positive so the image will be formed behind the mirror​

Posted by

avinash.dongre

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