Angular Magnification in Telescope
Trending Questions
Q. The eyepiece of a refracting telescope has f=9 cm. In the normal setting, seperation between objective and eyepiece is 1.8 m. Find the magnification.
- 20
- 19
- 18
- 21
Q. When diameter of the aperture of the objective of an astronomical telescope is increased, its
- Magnifying power is increased and resolving power is decreased
- Magnifying power and resolving power both are increased
- Magnifying power remains the same but resolving power is increased
- Magnifying power and resolving power both are decreased
Q. If the tube length of astronomical telescope is 105 cm long and magnifying power is 20 for normal setting. Calculate the focal length of objective.
- 100 cm
- 10 cm
- 20 cm
- 25 cm
Q. Diameter of the moon is 3.5×103 km and its distance from the earth is 3.8×105 km. It is seen by a telescope whose objective and eyepiece have focal lengths 4 m and 10 cm respectively. The angular diameter of the image of the moon is (assume final image is at infinity)
- 0.36 radian
- 0.009 radian
- 0.011 radian
- 0.022 radian
Q. An astronomical telescope is to be designed to have a magnifying power of 50 in normal adjustment. If the length of the tube is 102 cm, find the powers of the objective and the eyepiece.
- 10;100
- 1;50
- 10;500
- 2;100
Q. The angle subtended by the moon, at the objective lens of an astronomical telescope, is 0.5 rad. The focal length of the objective lens and the eyepiece of the telescope are 30 cm and 10 cm respectively. Find the angle subtended by the final image, at the eyepiece, in case of the least strain on the eye.
Q. The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eye-piece is found to be 20 cm. The focal lengths of the lenses are
Q. Focal length of the objective and eyelenses of a telescope are 200 cm and 5 cm. The maximum magnifying power of the telescope is
- 40
- 48
- 60
- 100