Question

find the focal length of convex mirror curvature is 30cm.​

Answer 1

Given that ,

• Radius of curvature of convex mirror = 30 cm

We know that , The relation between focal length and radius of curvature is given by

$\star \: \: \sf \fbox{r = 2f}$

Thus ,

$\Rightarrow \sf 30 = 2f \\ \\ \Rightarrow \sf f = \frac{30}{2} \\ \\ \Rightarrow \sf </p><p>f= 15 \: \: cm</p><p>$

$\therefore \bold{\sf \underline{The \: focal \: length \: is \: 15 \: cm}}$

Answer 2

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$\huge\bold{\mathtt{QUESTION}}$

➡ Find the focal length of convex mirror if radius of curvature is 30 cm .

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$\huge\bold{\mathtt{ANSWER}}$

✳ Radius of curvature = 30 cm

☯ As we know , Radius of curvature is twice the focal length .

Now , $\sf \:\:\:{\underline{\red{Radius\:of\:curvature\:=\: 2 \times Focal\:length}}}$

$\sf \:\:\:{\mathtt{\red{Focal\:length\:=\: \dfrac{Radius\:of\:curvature}{2}}}}$

$\sf \:\:\:{\mathtt{\red{Focal\:length\:=\: \dfrac{30}{2}}}}$

$\sf \:\:\:{\underline{\red{Focal\:length\:=\: 15\:cm\:or\:0.15\:m}}}$

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