Question

how to you get a virual image with a concave mirror ​

Answer 1

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A plane mirror will always produce a virtual image. A concave mirror will only produce a virtual image if the object is located in front of the focal point.

Answer 2

The object should be placed in front of the concave mirror between the pole and the principal focus (i.e. object distance < 20 cm) to obtain an erect image. This image is virtual, erect and enlarged, and is formed behind the mirror.