Appealingu and the had thesmile and cantios in being caught-Physics"Question: -À connex cens forma a real image on ascreen when object is placed at 10 cm fromhe screen. On shifting the lens by 2 cm, areal image is again formed on the screen,Find the focal length of the lens.Answer: -?

Answers (1)

Although this is not a question of Mathematics it is question of Physics but I have answered.

this is formula of finding focal length using displacement method.

  f=fracD^2-Delta ^24*D?

Where f represents focal length

            Δ representsdisplacement of lens done in order to get image again on screen.

           D represents  distance between object and screen.

  f=frac10^2-2^24*10

  f=2.4 , cm

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