| 1 |
The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece. |
- A. 10 cm
- B. 100 cm
- C. 1000 cm
- D. 5 cm
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| 2 |
In an object is placed in between focus point and Opticla center of a convex lens, the image formed by lens is. |
- A. Real inverted
- B. Virtual diminshed
- C. Virtual inverted
- D. Virtual erected
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| 3 |
If an object lies at focus point F in front of a converd lens, its image is formed at. |
- A. 2F
- B. F
- C. 3F
- D. Infinity
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| 4 |
The magnification of a convex lens of focal length 5 cm is equal to. |
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| 5 |
If focal length of objective and eye piece is 0.5 m and 10 cm respectively then magnifying power of telescope will be. |
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| 6 |
Using a graded Index fibre, the time difference is reduced to about. |
- A. 1 ns per km
- B. 33 ns per 100 km
- C. 33 ns per km
- D. 1 ns per 100 km
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| 7 |
The ratio of size of image and size of object is |
- A. Focal length
- B. Magnification
- C. Resolving power
- D. Principle focus
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| 8 |
A convex lens can be used as |
- A. Simple microscope
- B. Compound microscope
- C. Telescope
- D. Spectrometer
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| 9 |
In Michelson's experiment the relation used to find the speed of light is |
- A. 16 fc
- B. 1/16 fd
- C. 16 fd
- D. 16/fd
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| 10 |
If the object is at 5 cm from the lens of simple microscope than its magnifying power will be. |
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