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An optical instrument used for angular m...

An optical instrument used for angular magnification has a 25 D objective and a 20D eyepiece. The tube length is 25 cm when the eye is least strained . Whether it is a microscope or a telescope?

Text Solution

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`f_0 = 100/25 cm = 4cm`
` f_0 = 100/20 cm = 5 cm`
Since `f_0 lt f_e` therefore the optical instrument is a compound microscope.
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