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Four double convex lenses with following...

Four double convex lenses with following specifications are available
Lens, A, B, C, D,
focal length, 100 cm, 100 cm, 0 cm, 5 cm,
aperture, 10 cm, 5 cm,2 cm, 2 cm.
Which of the given four lenses should be selected as objected and eyepiece to construct an astronomical telescope and why ? What will be the magnifying power and length of the tube of the telescope ?

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