An Astronomical Refracting Telescope Is Made from Two Lenses $114 \mathrm {~cm} \text {, }$

question 206

Multiple Choice

An astronomical refracting telescope is made from two lenses.The objective lens has a focal length of $114 \mathrm {~cm} \text {, }$ and the eyepiece lens has a focal length of $17.0 \mathrm {~cm} \text {. }$ (a) What is the total length of the telescope? (b) What is the angular magnification of the telescope?
(c) What is the magnification by turning the telescope around and looking through the objective lens first?

• A)(a)131 cm (b)6.71
• (c)0.15
• B)(a)97 cm (b)0.15
• (c)6.71
• C)(a)262 cm (b)0.87
• (c)1.15
• D)(a)194 cm (b)1.18
• (c)0.85

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