| 1 |
Total confined light is obtained by |
- A. Total internal reflection
- B. Refraction of light
- C. Diffraction
- D. Polarization
|
| 2 |
The device used to study the spectra from different sources of light is |
- A. Telescope
- B. Optical fibre
- C. Spectrometer
- D. Microscope
|
| 3 |
Multimode step index fiber is useful for. |
- A. Long distance
- B. Sort distance
- C. Very long distance
- D. Infinite distance
|
| 4 |
A convex lens can be used as |
- A. Simple microscope
- B. Compound microscope
- C. Telescope
- D. Spectrometer
|
| 5 |
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
|
| 6 |
The optical fibre is covered for protection by |
- A. Glass jacket
- B. Plastic jacket
- C. Steel jacket
- D. Diamond jacket
|
| 7 |
The ratio of size of image and size of object is |
- A. Focal length
- B. Magnification
- C. Resolving power
- D. Principle focus
|
| 8 |
The focal length of a concave lens is always |
- A. +ve
- B. -ve
- C. Zero
- D. None of these
|
| 9 |
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>
|
| 10 |
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
|