Question

which property of concave mirror utilised for using them as shaving mirror?
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Answer 1

Answer:

When an object is held between the pole and principal focus of a concave mirror, a virtual, erect and magnified image of the object is formed. This is the property utilized for using them as shaving mirrors

Answer 2

Concave mirror always converges the light rays .

But when the object is placed between the focus and the pole it magnifies the image of the object.Thus image formed by concave mirror is much bigger than object.

Hope this helps...