how can you identify the concave mirror without touching it
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If the image is erect and magnified , and it gets inverted on moving the mirror away from the face , the given mirror is a concave mirror .
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You can test it using any object like candle and see whether the image formed is according to the properties of image formation by a concave mirror i.e. if the image is real and inverted, enlarged or diminished etc.
You can test it by keeping the object at varying distances from the mirror.
Good luck!!
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