The following is the data for an image formed by a convex mirror:
Object distance = 30 cm,
Size of object = 10 cm,
Size of image =2.5 cm,
The focal length of this mirror is ________ .
1
30 cm
2
20 cm
3
15 cm
4
10 cm
The following is the data for an image formed by a convex mirror:
Object distance = 30 cm,
Size of object = 10 cm,
Size of image =2.5 cm,
The focal length of this mirror is ________ .