light ncert

    Cards (11)

    • image formed by a plane mirror is always virtual and erect and laterally inverted
    • pole IS part of the mirror
    • centre of curvature is NOT a part of the mirror
    • C lies in front of concave and behind convex (reflecting surfaces)
    • PC = R
    • principal axis is the normal to the mirrors at their poles
    • if rays parallel and close to the principal axis are incident on a spherical mirror, after reflection, the pass or seem to come from a point on the principal axis. this point is called the principal focus
    • diameter of reflecting surface of a spherical mirror is called the aperture
    • aperture is smaller than R
    • radius of curvature = 2f
    • convex mirrors are preferred in rear view mirrors as they always give an erect (though diminished) image of an object, and they give a wider field of view as they are curved outwards, enabling the driver to see more of the road than possible with a plane mirror.
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