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3. Find the matrix for the symmetry operator with respect to the plane xOy in the basis
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Answer #1

in the basis i,j,k we can define out position vector as ai+bj+ck for position (a,b,c)

its reflection along xy-plane will just change its 3rd coordinate or z coordinate multiplied by -1

i.e. our required coordinates are (a,b,-c)

a T: b C -c

so our matrix would be

1 0 0 T = 0 1 0 0 0 -1

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