An optical instrument used for angular magnification has a 25 D objective and a \( 20 \mathrm{D}...

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An optical instrument used for angular magnification has a 25 D objective and a \( 20 \mathrm{D} \) eyepiece. The tube length is 25 \( \mathrm{cm} \) when the eye is least strained.
(i) Whether it is a microscope or a telescope?
(ii) What is the angular magnification produced?
(a) Microscope, 20
(b) Microscope, 40
(c) Telescope, 20
(d) Telescope, 40
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