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| Concave and Convex Lenses | | A light ray passing through the optical centre or the geometric centre of the lens, will go undeflected. |  | | To obtain an image of an object placed in front of a convex or concave lens, the direction of only the three light rays emanating from the object is sufficient to determine the position and size of the image. Depending on where an object is placed in front of a convex lens, the image formed can be inverted/erect, enlarged/diminished and real/virtual. The distinction between real and virtual images is : when an image formed is on the opposite side of the lens as the object, we say that the image is real and when the image formed lies on the same side as the lens, we say that the image is virtual. | | | | Previous | Next |
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