Question

What should be the position of object when a concave mirror is used as shaving mirror.

Answer 1

When you look into a concave mirror keeping your face close to the mirror you can see an enlarged and erected image of your face. This will make it easy to shave by seeing hair closely and clearly. This happens because when the object is kept at a distance less than the focal length of the concave mirror the image formed will be virtual, erect and enlarged. The position of the image formed will be behind the mirror, ie we can see it inside the mirror and all other imnages are formed in front of the mirror