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Question

Figure 5.49 shows an object AB placed on the principal axis of a lens L. The two foci of the lens are F1 and F2. The image formed by the lens is erect, virtual and diminished. Copy the diagram.

(a) What type of lens is it?
(b) Draw the outline of the lens (L) used.
(c) Draw a ray of light starting from B and passing through O. Show the same ray after refraction through the lens.
(d) Draw another ray from B, which after passing parallel to the principal axis, is incident on the lens and emerges after refraction from it. (d) Locate the final image formed.
[5 MARKS]


Solution

part a: 2 Marks
part b,c and d: 1 Mark each

(a) When an object is placed beyond the focus, in a convex lens a real image is formed, while in a convex lens a virtual image is formed. In the above case, an erect image is formed so it is a concave lens. 
The complete ray diagram is shown below in which A' B' is the final image formed by the lens.

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