Image Of a Point

What si the number of images of a point object held inbetween two plane mirrors inclined at an angle theta^(@) ?

Two plane mirrors are inclined at an angle of 72^(@) . The number of images of a point object placed between them will be

Two mirrors at an angle theta^(@) produce 5 images of a point. The number of images produced when theta is decreased to theta^(@) - 30^(@) is

Image OF point in plane OF tetrahedron || Scalar triple product

Find the image of the point with respect to line mirror.

The image of the point (-2, 3, 5) in XY-plane is

The image of the point (3,-8) in the line x+y=0 is

then image of the point (-1,3,4) in the plane x-2y=0

The image of the point (-1, 3, 4) in the plane x-2y=0 is

What is the image of the point (2, 3) in the line y=-x ?