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first of all we will calculate focal lenght from lens formula 1/v - 1/u = 1/f
put u = -45
1/90 + 1/45 = 1/f
it gives f = 30
Now again use lens formula and obtain image distance for u = - 50
you will get v = 75
Displacement = 90 - 75 = 15 cm
thanks
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