Question

An object placed at 50 cm from a lens produces a virtual image at a distance of 10 cm in front of the lens. What is the focal length of the lens?​

Answer 1

Answer:

Explanation:

Distance of object from the mirror u=−50 cm

Distance of image from the mirror v=−10 cm

For lens, we know

f

1

​  

=  

v

1

​  

−  

u

1

​  

 

f

1

​  

=  

−10

1

​  

−  

−50

1

​  

 

f=−12.5cm

It is a concave lens.