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Question
Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
Solution
The image formed by a concave lens is always virtual because it is formed on the left side of the lens. Let us take an object AB beyond the focus (f) as shown in the figure. The image A'B' is formed on the left side of the concave lens and is therefore, virtual. The image is upright. Also the height of A'B' is less than the height of AB. Therefore, the image is diminished.
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