Question

7.) The image of an object formed by a lens is of magnification - 1. If the distance between the
object and its image is 60 cm, what is the focal length of the lens? If the object is moved 20 cm
towards the lens, where would the image be formed? State reason and also draw a ray diagram
in support of your answer.
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Answer 1

Answer:

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Explanation:

Image with magnification -1 means image is inverted and of the same size. Therefore, object is at 2F and the image is also at 2F on the other side of the lens. ... This distance is less than the focal length, and the image formed in this case would be virtual, erect and will form on the same side as the object.