| 1 |
For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively. |
- A. 10 cm
- B. 20 cm
- C. 5 cm
- D. 120 cm
|
| 2 |
The device used to study the spectra from different sources of light is |
- A. Telescope
- B. Optical fibre
- C. Spectrometer
- D. Microscope
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| 3 |
The light emitted from light emitting diode has wave length. |
- A. 1.1 micro meter
- B. 1.3 micro meter
- C. 1.5 micro meter
- D. 1.7 micro meter
|
| 4 |
The magnifying power of a convex lens of focal lendth 10 cm is |
|
| 5 |
If an object is placed with in the focal length of a convex lens, its image is formed. |
- A. Real
- B. Inverted
- C. Virtual
- D. Smaller than object
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| 6 |
The light signal in Opticla fiber must be regenerated by advice called. |
- A. Regenerator
- B. Generator
- C. Repeater
- D. Diode
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| 7 |
The final image seen through ey piece in telescope is. |
- A. Real, enlarge and inverted
- B. Vertual, enlarge and erect
- C. Virtual, enlarge and inverted
- D. In Real, enlarge and erect
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| 8 |
The accepted value for speed of light in vacuum |
- A. 2.99 x 10<sup>8</sup>m - sec<sup>-1</sup>
- B. 2.99 x 10<sup>6</sup>m - sec<sup>-1</sup>
- C. 2.99 x 10<sup>8</sup>km - sec<sup>-1</sup>
- D. 2.99 x 10<sup>8</sup>m - h<sup>-1</sup>
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| 9 |
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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| 10 |
The focal length of convex lens |
- A. Negative
- B. Positive
- C. small
- D. Large
|