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  4. A simple microscope has a focal length of 5 cm. The magnification at the least distance of distinct vision is:

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Q. A simple microscope has a focal length of 5 cm. The magnification at the least distance of distinct vision is:

EAMCETEAMCET 1998

Solution:

The magnification of simple microscope when image is formed at least distance of distinct of vision is given by $ m=1+\frac{D}{f} $ $ \left( \begin{align} & \text{Given: focal length = 5cm} \\ & \text{least distance of distinct vision = 25cm} \\ \end{align} \right) $ $ =1+\frac{25}{5} $ = 6