Question

find the focal lenght of convex mirror whose radius of curvatures is 32cm

Answer 1

radius of curvature = 2×focl length..
therefore. 32=2×f
f=16 cm

Answer 2

we know

r = 2f  or   f = r/2

so,
     
      f  =  32/2 = 16cm

so,   focal length of mirror is 16 cm