In a simple microscope, the lens is held at a distance d from the eye and the image is formed at the least distance (D) of distinct vision from the eye. What is the magnifying power of the microscope?

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Q: 25 (NDA-I/2008)
In a simple microscope, the lens is held at a distance d from the eye and the image is formed at the least distance (D) of distinct vision from the eye. What is the magnifying power of the microscope?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,5,18,4,5,8,6

keywords: 

{'simple microscope': [0, 0, 1, 0], 'microscope': [0, 0, 1, 0], 'focal length': [1, 0, 5, 7], 'lens': [0, 0, 0, 1], 'lense': [0, 0, 1, 0], 'least distance': [0, 0, 1, 0], 'power': [24, 3, 21, 61], 'eye': [11, 1, 6, 5], 'distinct vision': [0, 0, 1, 0], 'image': [0, 1, 3, 23]}