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Two lenses of power +1.5D and -0.5D are ...

Two lenses of power `+1.5D` and `-0.5D` are kept in contact on their principal axis . What is the effective power of the combination ?

Text Solution

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Effective power `P=P_(1)+P_(2)` , i.e. `P=1.5-0.5=1.0D`
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