An object and a screen are kept at a distance of 120
cm. A lens is kept between them so that a real image is
formed on the screen for two different positions of the
lens. Difference between the positions of the lens is 60
cm. The focal length of the lens is -
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Answer:
22.5cm
Explanation:
this is the case of displacement method
distance between object and screen a=120cm
distance between two position of lens d=60cm
formula for focal length f =a^2-b^2/4a
put it value
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