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JEE PHYSICS MCQ: RAY OPTICS
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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
eyepiece is 20.02 m.
(b) The magnification of the telescope is (–) 1000.
(c) The image of the planet is erect and diminished.
(d) The aperture of eye piece is smaller than that of objective.
The correct statements are:
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
eyepiece is 20.02 m.
(b) The magnification of the telescope is (–) 1000.
(c) The image of the planet is erect and diminished.
(d) The aperture of eye piece is smaller than that of objective.
The correct statements are:
View answer and explanation
Correct option: A
(a), (b) and (d)
Option A ((a), (b) and (d)) is correct because the distance between the objective and eyepiece is the sum of their focal lengths, the magnification is the ratio of the objective's focal length to the eyepiece's, and the eyepiece aperture is smaller.
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