Question

4. The radius of curvature of the concave mirror is 30m. Then find the focal length of the mirror?
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Answer 1

Answer:

${\boxed{\bold\green{Focal\:length=15\:m}}}$

Step-by-step explanation:

Given that,

• $\bold\green{Radius(R)=30\:m}$
• $\bold\purple{Focal\:length=\:?}$

Formula used:-

${\boxed{\bold{Radius \:=2\times Focal\:length}}}$

$\rightarrow\sf 30 = 2 \times Focal\:length \\\\\rightarrow\sf Focal\:length =\frac{30}{2}\:m \\\\\rightarrow\sf Focal\:length = 15\:m$

$\therefore\bold{\underline{Focal\:length =15\:m }}$