Which of the following is/are true?
A plane mirror has a smooth surface.
A plane mirror can alter the path of light rays falling on its surface.
A plane mirror has a smooth surface, which reflects light rays falling on it. i.e. changes the path of the light rays incident on it.
A plane mirror has a smooth surface to produce a clear image.
A plane mirror does not allow all the light incident on it to pass through, so it is not transparent.