What condition for a lens to behave as converging or diverging in a medium?
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f(liq)=(aUg-1)×aUl×f(air)/( aUg-aUl) this formula bassed on behavioural change of lens in a liq if 1. aUg >aUl then fliq>fair then pliq < pair then nature of lens not change 2. aUl>aUg then fair> fliq then convex behave concave and vis versa 3. aUl=aUg then fliq =infinte then p=0 lens behave as glass plate
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