Question: 1 . ( 2 0 point ) Consider two mirror planes that intersect at a 1 3 5 deg angle as shown in the

1 . (20

point

)

Consider two mirror planes that intersect at a

135 \

deg angle as shown in the figure below. Find all derivative symmetry elements geometrically and mark them on the figure. Hint: using the figure above place a single point near one of the planes, and then applying m

1

and m

2,

place symmetrically equivalent points

(

1

and m

2

to be applied to both the original point and to all new points that appear

) .

Continue until no new symmetrically equivalent points appear in the drawing.

1 . ( 2 0 point ) Consider two mirror planes that

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