b) 15cm is the right answer.
The focal length of a spherical mirror of radius of curvature 30cm is:
a) 10cm
b) 15cm
c) 20cm
d) 30cm
a) 10cm
b) 15cm
c) 20cm
d) 30cm
The focal length of a spherical mirror of radius of curvature 30cm is:
a) 10cm
b) 15cm
c) 20cm
d) 30cm
a) 10cm
b) 15cm
c) 20cm
d) 30cm