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## Homework Statement

How does the wave function of spin 1/2 change under parity?

## Homework Equations

## The Attempt at a Solution

The behavior of the eigenfunctions of orbital angular momentum

**L**is easily seen from their explicit form, namely spherical function Y

^{m}

_{l}is multiplied by (-1)

^{l}, where l=0,1,2,...

Spin operator S commutes with the parity, so the eigenket of S is expected to be a parity eigenket.