1.

Draw the ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed (i) at 2 F_(1), (ii) between F_(1) and optical centre O of the lens.

Answer»

Solution :(i) When the object AB is placed at `2F_(1)`, the IMAGE A'B' FORMED at `2F_(2)` is real, inverted and of same SIZE as the object, as shown in the ray DIAGRAM in Fig.

(ii) When the object AB lies between `F_(1)` and OPTICAL centre O of convex lens, the image A'B' is formed on the same side of the lens as the object. The image is virtual, erect and magnified as shows in the ray diagram


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