Question

a concave mirror of focal length f produces an image in time farther than the object. if the image is real then the distance of the object from the mirror is​

Answer 1

Since the image is real, it must be inverted and magnification ratio should be negative.

Mgnification =  

u

−v

​  

 

−n=  

d

−v

​  

 ,  u=d is the distance of object and and image distance is v

v=nd

Now using mirror formula

f

1

​  

=  

v

1

​  

+  

u

1

​  

 

f

1

​  

=  

nd

1

​  

+  

d

1

​  

 

So d=  

n

f(n+1)

​