If a lens (made of glass) of refractive index is immersed in a liquid of refractive index , then its focal length in liquid, f1 is shown by
... (i)
if fa is the focal size of lens in air, then
... (ii)
Displacement method:
By this method focal length of convex lens is determined.
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Consider an object and a screen placed at a distance D ( > 4f) apart. Let a lens of focal length f be placed between the object and the screen.
(i) For two different points of lens two pictures ( I1 and I2) of an object are formed at the screen.
(ii) Focal length of the lens 
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where 
(iii) Size of object 
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