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I have two questions which has been troubling me:

1. How can we say that meaning of e^(jkR) is a spherical wave travelling in negative R direction. It can be viewed as polar form of vector with magnitude 1, but how a spherical wave?

2. When we take instantaneous value of a complex quantity , why is real part only considered?

1. How can we say that meaning of e^(jkR) is a spherical wave travelling in negative R direction. It can be viewed as polar form of vector with magnitude 1, but how a spherical wave?

2. When we take instantaneous value of a complex quantity , why is real part only considered?

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