Question

A convex lens forms an image at 30 cm from lens on a screen.if the focal length of lens is 20 cm, find the distance at which the object is placed.

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Answer 1

Answer:

Here,

Image distance=v=20cm,

Object distance=u=−30cm,

Lens equation is given by,

v

1

​  

−  

u

1

​  

=  

f

1

​  

,

putting the values we get,

20

1

​  

−  

−30

1

​  

=  

f

1

​  

,

∴f=12cm

∴ Focal length of convex lens=f=12cm

Explanation:

Answer 2

Answer:

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