Question

3.33
Astronomical telescope is made of two lenses : objective lens and eye - piece separated by
a certain distance to see heavenly bodies. The focal length of the objective lens of
astronomical telescope is 80 cm and that of eye – piece is 4 cm. the diameter of moon is
3.0 x 105 km and distance of moon from earth is 3.75 x 108 km.
i) The final image is obtained by astronomical telescope is :
(a) real and inverted (d) virtual and inverted (c) real and erect (d) virtual and erect
ii) Magnifying power of the telescope is :
(a) 5
(b) 10
(C) 15
(d) 20
iii) The length of the tube is :
(a) 76 cm
(b) 84 cm
(C) 7.6 cm (d) 8.4 cm
iv) Angular size of the image of the moon is :
(a) 0.05°
(b) 0.01°
(C) 0.1°
(d) 1°
v) The magnifying power of a telescope can be increased by using lens :
(a) objective of large focal length
(b) Objective of small focal length
(C) Eye - piece of large focal length (d) all of the above
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Answer 1

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