If an astronomical telescope has the magnification of -31.0 ? and its objective lens has a...

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If an astronomical telescope has the magnification of -31.0 ?and its objective lens has a focal length of 75 cm, what is thefocal length of its eyepiece?
cm
What is the overall length of the telescope when adjusted for arelaxed eye?
cm

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3.6 Ratings (509 Votes)

Magnification M = -31

Focal length of objective f _o = 75 cm

Focal length of eye piece f _e = ?

We know M = f _o / f _e

From this f _e = f _o / M

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = -2.419 cm

(b). The overall length of the telescope when adjusted for a relaxed eye L = f _o + f _e

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 77.41 cm

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If an astronomical telescope has the magnification of -31.0 ? and its objective lens has a...

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Question

Physics

If an astronomical telescope has the magnification of -31.0 ?and its objective lens has a focal length of 75 cm, what is thefocal length of its eyepiece?
cm
What is the overall length of the telescope when adjusted for arelaxed eye?
cm

Answer & Explanation Solved by verified expert

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If an astronomical telescope has the magnification of -31.0 ? and its objective lens has a...

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70.2K

Verified Solution

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Physics

If an astronomical telescope has the magnification of -31.0 ?and its objective lens has a focal length of 75 cm, what is thefocal length of its eyepiece?cmWhat is the overall length of the telescope when adjusted for arelaxed eye?cm

Answer & Explanation Solved by verified expert

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If an astronomical telescope has the magnification of -31.0 ?and its objective lens has a focal length of 75 cm, what is thefocal length of its eyepiece?
cm
What is the overall length of the telescope when adjusted for arelaxed eye?
cm