. A convex lens of focal length F can form a magnified erect as well as inverted image


Justify this statement stating the position of the object with respect to the lens in each case for obtaining these images

Best Answer

Ans. The type of image formed by a convex lens depends on the position of the object in front of the lens.

•When the object is placed between the optical centre and the focus (i.e., between 0 and F'), the image formed is behind the object (on the same side). It is virtual, magnified and erect.

• When the object is placed at the focus of a convex lens, the image formed is at infinity. It is real, inverted and high y magnified.

• When the object is placed between focus and the centre of curvature (i.e., between F' and 2F'), the image formed is beyond 2F. It is real, inverted and magnified.

• When the object is placed at the centre of curvature (i.e., at 2F'), the image formed is at 2F. It is real, inverted and of same size of the object.

• When the object is beyond 2F' (or beyond centre of curvature), the image formed is between F and 2F. It is real, inverted and diminished.

• When the object is at infinity, the image formed is at focus. It is real, inverted and much smaller than the object (highly diminished).

 

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