Power of combination of lenses is 5D.if the power of this combination is to be changed to 4D. Then find nature of lens to be added and its focal length
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power has to be reduced to 4D from 5D so a lens of negative power has to be added that is concave lens.
It's power should be -1D.
as we know,
P=1/f
-1 = 1/f
f = -1m or -100cm
It's power should be -1D.
as we know,
P=1/f
-1 = 1/f
f = -1m or -100cm
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