An astronomical refracting telescope is being used by an observer to… | NEET 2022 (Phase 2)

Q19NEET 2022 · PHASE 2Easy

Optical Instruments & the Eye

An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction of the telescope are 20 m and 2 cm respectively. Consider the following statements about the telescope: (a) The distance between the objective and eye piece is 20.02 m

(a) The magnification of the telescope is ( $-$ ) 1000

(b) The image of the planet is erect and diminished

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Answer: (a)

(a) $L = f_o + f_e = 20 + 0.02 = 20.02\,\text{m}$ : true.
(b) $m = -\dfrac{f_o}{f_e} = -\dfrac{20}{0.02} = -1000$ : true.
(c) Final image of an astronomical telescope is inverted: false.
(d) Objective has the larger aperture to collect light, eyepiece smaller: true.
So the answer is (a) (a), (b) and (d).

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Optical Instruments & the Eye question from NEET 2022 (Phase 2)

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