Question

reason for getting our clear and bright image in a plane mirror

Answer 1

The light rays passing through everywhere reflect the rays passing on plane mirror and we see our image in plain mirror

Answer 2

HEYA!!!
HERE'S YOUR ANSWER!!!
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When we see ourselves in a mirror or on a plane surface we are able to see ourselves because the rays of light gets reflected backwards. Although they also get reflected by all other surface but they are not smooth so we aren't able see ourselves.

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HOPE IT HELPED!!!