1, select the concave plane mirror. Because the plane mirror imaging is the same as the human body, and the concave mirror imaging will be slightly smaller than itself.

2. Tilt it with a flat mirror. Because when the mirror is tilted, the vertical viewing angle is enlarged and elongated, and the figure will appear a little longer than the actual one.

The mirror's reflection of light obeys the law of reflection, and its reflection ability depends on the angle of incident light, the smoothness of the mirror and the properties of the plated metal film. The imaginary line perpendicular to the mirror is called the normal, and the angle between the incident light and the normal is equal to the angle between the reflected light and the normal. The object in front of the plane mirror becomes an upright virtual image behind the mirror, and the distance from the virtual image to the mirror surface is equal to the distance from the object to the mirror surface.

If you want to see my whole length in the mirror, the mirror must be at least half my length, because the incident angle is equal to the reflection angle. The reflective surface of concave mirror faces the center of curvature.

Extended data:

Imaging law of concave mirror

When the object distance is less than the focal length, it becomes a vertical magnified virtual image. The closer the object is to the mirror, the smaller the image is. When the object distance is equal to a focal length, no image is formed, and when the object distance is between one and two focal lengths, it becomes an inverted magnified real image. The farther the object is from the mirror, the smaller the image. When the object distance is equal to twice the focal length, it becomes an anti-reflection real image. When the object distance is greater than twice the focal length, it becomes an inverted and reduced real image. The farther the object is from the mirror, the smaller the image. The real image is on the same side as the object, and the virtual image is on the opposite side.

References:

Baidu encyclopedia concave mirror imaging

Baidu encyclopedia? mirror