An optical instrument uses a lens of power \( 100 \mathrm{D} \) for objective lens and \( 50 \ma...

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An optical instrument uses a lens of power \( 100 \mathrm{D} \) for objective lens and \( 50 \mathrm{D} \) for its eyepiece. When the tube length is kept at 25 \( \mathrm{cm} \), the final image is formed at infinity.
Identify the optical instrument.
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