A window Mirror 2 fold R 2 fold R SolutionA line of symmetry

Solution

A line of symmetry is a line that divides a figure into two corresponding parts, each of which is the mirror image of the other. The line of symmetry is also called the mirror line and can occur in any direction. Line symmetry is also known as reflection symmetry, mirror symmetry, mirror-image symmetry or bilateral symmetry. A line of symmetry occurs in two-dimensional objects, while a plane of symmetry occurs in three-dimensional ones.

In the above given 1(b) figure 1 rotation axis (4-fold) out of plane of figure exists

Also 2 diagonal mirrors perpendicular to a 4-fold rotational axis exists

Identity element also exists

In the second question correct answer is c

since mirror in the 1c figure in the plane of figure exists.

In the third question I see 3 symmetry figures as we can clearly see from the three snakes in the figure