| 1 |
The focal length of a concave lens is always |
- A. +ve
- B. -ve
- C. Zero
- D. None of these
|
| 2 |
The magnifying power is also called |
- A. Resolving power
- B. Angular magnification
- C. Strength of eye
- D. None of these
|
| 3 |
The types of optical fibres are |
- A. Three
- B. Four
- C. Five
- D. Six
|
| 4 |
If the object is at 5 cm from the lens of simple microscope than its magnifying power will be. |
|
| 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
|
| 6 |
The focal length of convex lens |
- A. Negative
- B. Positive
- C. small
- D. Large
|
| 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 magnifying power of a convex lens of focal lendth 10 cm is |
|
| 9 |
The Detector in Photo phone is made up of. |
- A. Cadmium
- B. Germanium
- C. Selenium
- D. Silicon
|
| 10 |
The speed of light was measured correctly by |
- A. Galileo
- B. Michelson
- C. Newton
- D. Maxwell
|
