two lenses of power minus 2.5 D and + 1.5 D are placed in contact find the total power of the combination of length calculate the focal length of this combination
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Total power=-2.5+1.5=-1 D
Focal length=1/D
=1/-1
=1 m
=100 cm
Focal length=1/D
=1/-1
=1 m
=100 cm
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