a) What is meant by the focal length of a converging lens? (b) An object is placed in front of a converging lens. A real image is formed, as shown in Fig. 7.1. The converging lens is not shown. (i) Explain what is meant by a real image. (ii) Rays of light from point A on the object form point B on the image. On Fig. 7.1, draw 1. a ray to find the position of the converging lens, showing the lens as a vertical straight line in this position, 2. a ray to find the position of a principal focus of the lens, marking this position F, 3. a third possible ray from A to B. (iii) The distance between the object and the lens is increased. State any changes which take place in 1. The distance of the image from the lens, 2. The size of the image.
(a) What is meant by the focal length of a converging lens?
(b) An object is placed in front of a converging lens. A real image is formed, as shown in Fig. 7.1.
The converging lens is not shown.
(i) Explain what is meant by a real image.
(ii) Rays of light from point A on the object form point B on the image.
On Fig. 7.1, draw
1. a ray to find the position of the converging lens, showing the lens as a vertical straight line in
this position,
2. a ray to find the position of a principal focus of the lens, marking this position F,
3. a third possible ray from A to B.
(iii) The distance between the object and the lens is increased. State any changes which take place in
1. The distance of the image from the lens,
2. The size of the image.
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