Question

answred the question in the attachment.. please help me friends..​

Answer 1

Answer:

If a magnification of, –1 (minus 1) is obtained by using a converging lens, then the object has to be placed (b) at 2f.

Explanation: When an object is positioned at 2f the size of the shaped image will be equal to the object's dimension. Hence we get a 1 Magnification

Explanation:

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Answer 2

Answer:

At 2f

When an object is placed as 2f the size of the image formed will be equal to size of the object. therefore we get the magnification of 1.