Question

A convex mirror has a focal length of 19 cm. The image of an object 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:

Recall the formation of image by a convex mirror. The image formed by a convex mirror is always a virtual image and cannot be projected on a screen. The image is smaller than the object from the distance but gets larger as the object gets closer to the mirror.

Magnification formula along with mirror formula can be used to obtain the distance of the object from the mirror.

Explanation:

Answer 2

Answer:

f=18cm

Magnification=m=  

2

1

​

=  

u

−v

​

 

⟹v=  

2

−u

​

 

v

1

​

+  

u

1

​

=  

f

1

​

 

u

−2

​

+  

u

1

​

=  

f

1

​

 

⟹u=−f=−18cm

And, v=9cm