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A bright point object is kept at some distance from a lens of focal length 20 cm. If the object distance ischanged 5/6 times, the distance of the screen from the lens has to be changed by 5/3 times to obtain aclear image on the screen. Find the distance through which the screen has been moved. solve plzzzzzz i will surely approve.......

A bright point object is kept at some distance from a lens of focal length 20 cm. If the object distance ischanged 5/6 times, the distance of the screen from the lens has to be changed by 5/3 times to obtain aclear image on the screen. Find the distance through which the screen has been moved.


solve plzzzzzz      i will surely approve.......

Grade:Upto college level

1 Answers

Chetan Mandayam Nayakar
312 Points
9 years ago

let the initial object and screen distances be u and v, (1/u)+(1/v)=(1/20)

(6/5u)+(3/5v)=(1/20) solve the equations for u and v, answer=(5v/3)-v=2v/3

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