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An object 30 cm. tall is placed on principal axis of convex lens. Its 30 cm. Tall image is formed on screen placed at a distance of 15 cm. from the lens.

Calculate focal length of lens.


  • amb
  • Ambitious
H1=30 cm
h2=30 cm
v=15 cm

m= (h2/h1=v/u)

Now when object distance and image distance are the same then we can say that the object is placed at 2F..
2F = 15
F = 15/2.
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