Question

If radius of curvature is 20cm find the focal length of concave mirror​

Answer 1

★$\bold{\underline{\underline{\rm{\red{Question:-}}}}}$

• If radius of curvature is 20cm find the focal length of concave mirror.

★$\bold{\underline{\underline{\rm{\pink{Answer:-}}}}}$

• Focal length of concave mirror is 10cm.

★$\bold{\underline{\underline{\rm{\green{To \:find:-}}}}}$

• Focal length (f) of the concave mirror.

★$\bold{\underline{\underline{\rm{\orange{Given:-}}}}}$

• Radius of curvature (r) = 20cm.

★$\bold{\underline{\underline{\rm{\blue{Explanation:-}}}}}$

Using formula,

$\implies { \boxed{\red{\sf {\: f = \dfrac{r}{2}}}}}$

Now,

$\\ \sf\longmapsto \: f = \dfrac{20}{2}$

$\\ \\ \sf\longmapsto \: f = 10cm$

Therefore, focal length of the concave mirror is 10cm.

Answer 2

${\huge{\bold{\purple{\bigstar{\boxed{\boxed{Question}}}}}}}$

• If radius of curvature is 20cm find the focal length of concave mirror

${\huge{\bold{\purple{\bigstar{\boxed{\boxed{Answer}}}}}}}$

$\sf{\bold{\blue{\boxed{\boxed{Given}}}}}$

• radius of curvature = 20cm

$\sf{\bold{\green{\boxed{\boxed{To\:find}}}}}$

• focal length of the mirror

$\sf{\bold{\pink{\boxed{\boxed{solution}}}}}$

$\sf{\bold{\orange{\boxed{\boxed{focal length = \dfrac{radius \:of \:curvature }{2}}}}}}$

$\sf\longrightarrow \dfrac{20}{2}$

$\sf\longrightarrow \dfrac{\cancel 20}{\cancel 2}$

$\sf\longrightarrow{10cm}$

$\sf{\bold{\pink{\boxed{\boxed{ 20 cm}}}}}$

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