| 1 |
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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| 2 |
Total confined light is obtained by |
- A. Total internal reflection
- B. Refraction of light
- C. Diffraction
- D. Polarization
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| 3 |
The first person who attempted to measure the speed of light was. |
- A. Michelson
- B. Hygen's
- C. Galileo
- D. Ability
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| 4 |
A convex lens acts as diverging lens if the object is placed at |
- A. F
- B. 2F
- C. Between F and 2 F
- D. Within the F
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| 5 |
The diameter of a lens is called |
- A. Focal length
- B. Aperture
- C. Principle axis
- D. Centre
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| 6 |
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
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| 7 |
Critical angle is that incident angle in denser medium for which angle of refraction is. |
- A. 0 <sup>o</sup>
- B. 45 <sup>o</sup>
- C. 90 <sup>o</sup>
- D. 120 <sup>o</sup>
|
| 8 |
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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| 9 |
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
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| 10 |
Multimode graded index fibre has a core whose diameter range lie from. |
- A. 5 to 50 micro meter
- B. 50 to 100 micro meter
- C. 40 to 1000 micro meter
- D. 50 to 10,000 micrometer
|