Question

How far apart are an object and its image formed by a converging lens of focal length 12cm if the image is real and 3 times than the object?

Answer 1

Answer:

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Explanation:

v

1

​  

−  

u

1

​  

=  

12

1

​  

 

uv

u−v

​  

=  

12

1

​  

   -(1)

m=  

u

−v

​  

=3

v=−3u

using equation (1)

−u×3u

u+3u

​  

=  

12

1

​  

 

u=−16cm

∴v = 48 cm

So u−v= 64 cm