Question

the radius of curvature of spherical mirror is 30 cm what is its focal length

Answer 1

F=2R

given R=30cm

F=2×30=>60cm..

so focal length would be 60cm

Answer 2

het mate here is your ans
radius of curvature ,c=30 cm
and c=2f
so 30=2f
f=30/2=15cm