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  1. In mirrors the back surface is coated with a thin layer of :

  2. A.

     Mercury

    B.

     Silver

    C.

     Red oxide

    D.

     Silver nitrate

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    Answer : Option B

    Explanation :

    In a spherical mirror, one of the two curved surfaces is coated with a thin layer of silver followed by a coating of red lead oxide paint. Thus, one side of the spherical mirror is opaque and the other side is a highly polished reflecting surface.


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