Angular magnitude and apparent size

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Angular magnitude and apparent size

It is well known that street lamp-posts appear to be shorter the further they are away, although, in fact, all are of the same height.
The angular magnitude of an object is the angle it subtends at the eye. This angle

Angular magnitude and apparent size

Angular magnitude and apparent size

determines the size of the image formed on the retina and hence governs the apparent size of the object (Fig. 24.22).

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Angular magnitude and apparent size