GK
HUMAN BODY AND REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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15 cm
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25 cm
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35 cm
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45 cm
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Detailed explanation-1: -The magnifying power of a simple microscope is given by M=1+Df, when the final image is at minimum distance of distinct vision. In the question, it is given that the least or minimum distance of distinct vision is 25 cm, and focal length of the microscope is 5 cm. Therefore, the correct answer is option D.
Detailed explanation-2: -The least distance of vision of a longsighted person is 60 cm. By using a spectacle lens, this distance is reduced to 12 cm.
Detailed explanation-3: -Least distance of distinct vision is 25 cm. The image of an object is formed at the least distance of distinct vision from the lens of a simple microscope of focal length 2.5 cm. Magnifying power of simple microscope is 6, when image is formed at distance of distinct vision, the focal length of simple microscope is : More items