An object is kept at a distance o 100cm for aliens of power -4D.Calculate the image distance.
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d=1/f
f=-25cm
1/f=1/u-1/V
1/V=1/20
Image is at 20 cm
f=-25cm
1/f=1/u-1/V
1/V=1/20
Image is at 20 cm
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