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  4. The length of a microscope tube is 20 cm . The focal length of the objective and eye lens are 0.5 cm and 1 cm . The magnifying power of the microscope is about:

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Q. The length of a microscope tube is $20 cm .$ The focal length of the objective and eye lens are $0.5 cm$ and $1 cm .$ The magnifying power of the microscope is about:

Ray Optics and Optical Instruments

Solution:

As we know the relation,
$m =\frac{ LD }{ f _{0} f _{e}}$
$m =\frac{20 \times 25}{0.5 \times 1}$
$m =10000$