Question

radius of curvature of a mirror is 30cm .what it s focal​

Answer 1

Answer: 15 cm

Explanation:

Radius of curvature/2 = Focal length

R/2 = F

30 cm/ 2 = F

15 cm = F

Answer 2

$\Large{\underline{\underline{\mathfrak{Answer :}}}}$

It's Focal length is 30 cm.

$\Large{\underline{\underline{\mathfrak{Explanation :}}}}$

We know that,

$\large{\underline{\boxed{\bf{f = \dfrac{R}{2}}}}}$

Where,

• R is Radius of curvature.
• f is focal length.

$\sf{\implies f = \dfrac{30}{2}} \\ \\ \sf{\implies f = 15}$

$\large{\underline{\boxed{\bf{Focal \: Length = 15 \: cm}}}}$