When a concave mirror has been used as a shaving mirror, where is the face of a person should be held in relation to the focus of the mirror?

In order to utilise a mirror as a shaving mirror, it must be concave. It's because we obtain a magnified, also virtual, picture when the concave mirror is set very close to the item or the person seeing through it. This could assist you in answering this query.

The ray diagram of a concave mirror that may be used as a shaving mirror should be drawn first.
To do this, we must be aware of the qualities of the shaving-friendly mirror. When someone is staring in the mirror, they should examine themselves more carefully. To gain a better look, the image needs also be expanded or magnified. Additionally, an upright picture should be produced by the mirror. Only when the picture is virtual in nature will this form. The concave mirror, in which the object should be positioned at a distance shorter than its focal length, has been utilised to attain all these features.

Therefore, the item need to be kept between the focus and the pole.

Hence, the correct answer is option D.