Question

b. A convex mirror has a focal length of
18 cm. The image of an objet kept
in front of the mirror is half the height
of the object. What is the distance of
the object from the mirror?​

Answer 1

Answer:

h/3= 6 cm....................

Answer 2

Hope you understand from the above pic.

Suggestions: For these types of questions you can either practise S Chand Guide or Oswaal Guide.It may help you a lot!

Thanks