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If the image is erect and equal in size and it does not change its size and nature on moving the mirror closer or away from the object, the mirror is plane mirror.

If the image is erect and magnified and it becomes inverted on moving the mirror away from the object, the mirror is concave mirror.

If the image is erect and diminished and remains erect on moving the mirror away from the object, the mirror is convex mirror.

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Q: How will you distinguish between plane mirror convex mirror and concave mirror without touching?
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