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(a) An object is seen through a simple m...

(a) An object is seen through a simple microscope of focal length `12cm`. Find the angular magnification produced if the image is formed at the near point of the eye which is `25cm` away from it.
(b) A `10D` lens is used as a magnifier. Where should the object be placed to obtain maximum angular magnification for a normal eye (near point `= 25cm)`?

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