The diagram in figure shows the position of an object OA in relation to a convergin lens L whose foci are at $F_{1} a n d F_{2}$ .

(i) Draw two rays to locate the position of image.

(ii) State the position of image with reference to the lens.

(iii) Describe three characteristics of the image.

(iv) Describe how the distance of image from the lens and its size change as the object as the object is moved towards $F_{1}$ .

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Solution

(i)

(ii) The position of the images will be more than twice the focal length of lens.

(iii) The image will be magnified, real and inverted.

(iv) As the object move towards $F_{1}$ the image will shift away from $F_{2}$ and it is magnified. At $F_{1}$ the image will form at infinity and it is highly magnified. Between $F_{1}$ and optical centre, the image will form on the same side of object and will be magnified, virtual and erect.

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