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Image Formation by Convex Lens

A convex lens...

Question

A convex lens of focal length 15 cm produces a magnification of +4. The object is placed:
(a) at a distance of 15 cm
(b) between 15 cm and 30 cm
(c) at less than 15 cm
(d) beyond 30 cm

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Solution

(c) At less than 15 cm:
A convex lens forms a virtual, erect and magnified image when an object is placed within the focus.

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Q. An object is placed at a distance of 30 cm in front of a convex lens. What is the focal length of the lens if the image is formed at a distance of 60 cm on the other side of the lens?

Describe the nature of image formed when an object is placed at a distance of 30 cm from a convex lens of focal length 15 cm.

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