Question

Concave mirror of focal length 12 cm, magnifies the object by three times its original size, the object distance should be….​

Answer 1

Explanation:

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Answer 2

Answer:

Focal length of a concave mirror f=12cm

Object length h=4

Real image length h  

′

=1cm

We know that,

 m=−  

u

v

​

=  

−f−(u)

−f

​

 

−  

u

1

​

=  

−12−u

−12

​

 

12+u=−48

u=−48−12

u=−60cm

Hence, the object distance is 60 cm

Explanation:

Focal length of a concave mirror f=12cm

Object length h=4

Real image length h  

′

=1cm

We know that,

 m=−  

u

v

​

=  

−f−(u)

−f

​

 

−  

u

1

​

=  

−12−u

−12

​

 

12+u=−48

u=−48−12

u=−60cm

Hence, the object distance is 60 cm