| 1 |
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
|
| 2 |
If the object is at 5 cm from the lens of simple microscope than its magnifying power will be. |
|
| 3 |
The Detector in Photo phone is made up of. |
- A. Cadmium
- B. Germanium
- C. Selenium
- D. Silicon
|
| 4 |
The magnifying power is also called |
- A. Resolving power
- B. Angular magnification
- C. Strength of eye
- D. None of these
|
| 5 |
The light signal in Opticla fiber must be regenerated by advice called. |
- A. Regenerator
- B. Generator
- C. Repeater
- D. Diode
|
| 6 |
The device used to study the spectra from different sources of light is |
- A. Telescope
- B. Optical fibre
- C. Spectrometer
- D. Microscope
|
| 7 |
The first person who attempted to measure the speed of light was. |
- A. Michelson
- B. Hygen's
- C. Galileo
- D. Ability
|
| 8 |
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
|
| 9 |
The focal length of a concave lens is always |
- A. +ve
- B. -ve
- C. Zero
- D. None of these
|
| 10 |
Image formed by a concave lens is |
- A. Real
- B. Virtual
- C. Erect
- D. None of these
|
