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An object of size 3.0 cm is placed 14 cm...

An object of size 3.0 cm is placed 14 cm in front of a concave lens of focal length 21 cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?

Text Solution

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`v = 8.4 cm`, image is erect and virtual. It is diminished to a size 1.8cm. As `urarroo, v rarrf` (but never beyond f while `m rarr 0`).
Note that when the object is placed at the focus of the concave lens (21cm), the image is located at 10.5 cm (not at infinity as one might wrongly think).
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