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Question

The given figure shows an object AB, placed on the principal axis of a convex lens. F1 and F2 are the foci of lens Copy the diagram.

(a) Draw a ray of light from point B and passing through O. Show the same ray after refraction through the lens.
(b) Draw another ray from B, which passes through F2, after refraction by the lens.
(c) Locate the final image formed.
(d) Is the image real or virtual?
(e) The image formed is inverted or erect?
[5 MARKS]

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Solution

Each subpart: 1 Mark each

(a) The ray passes through optical centre emerges out without any deviation after refraction.
(b) Another ray from B, after refraction passes through F2.
(c) The image of the object AB is A'B' as shown in the ray diagram below.
(d) The image is virtual.

(e) The image formed is virtual, so it is erect.

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