A person is viewing an extended object. If a converging lens is placed in front of his eye, will he feel that the size of object has increased ? Why ?
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A simple magnifier allows us to put the object closer to the eye than we could normally focus and forms an enlarged virtual images.
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The principle behind this is angular magnification.
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The magnification is Ma = 25/f y for the close focus point, but since that causes
eye strain, it is usually desirable to put the images at infinity giving Ma = 25/f. -
So, he ful the size of object increased. The reason is about mentioned.
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Angular magnification : The ratio of the angle subtended at the eye by the image formed by an optical instrument to the angle substended at the eye by the object being viewed.