Which of the following symmetry element is denoted by Sn?

Which of the following symmetry element is denoted by Sn? Correct Answer Improper rotation

An improper rotation is the composition of a rotation about an axis and a reflection in a plane perpendicular to that axis. Its group is denoted by Sn?. A group of proper rotations is denoted by Cn?, where n is the order of rotation.
Bissoy MCQ

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