| 1 |
Which types of image is formed by a concave lens on a screen? |
Inverted and real
Inverted and virtual
upright and real
Upright and virtual
|
| 2 |
The index of refraction depends on: |
The focal length
The speed of light
the image distance
The object distance
|
| 3 |
An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror? |
4.1 cm
8.2 cm
9.9 cm
20 cm
|
| 4 |
An object of placed at he centre of curvature of a concave mirror. The image produced by the mirror is located: |
out beyond the centre of curvature.
at the centre of curvature
between the centre of curvature and the focal point
at the focal point
|
| 5 |
A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance? |
5.0 cm
7.5 cm
15 cm
20 cm
|
| 6 |
Which of the following quantities is not change during refraction of light? |
Its direction
Its speed
its frequency
Its wavelength
|
| 7 |
Optical fibers work on the principle of: |
Refraction
Reflection
Total internal reflection
Diffraction
|
| 8 |
When the object is placed beyond 2F of a convex lens, the image formed will be: |
Real, inverted and smaller than the object
Real, inverted and of the same size as the object
Real, inverted and larger in size than the object
Virtual, erect and larger in size than the object
|
| 9 |
If focal length of a lens is 1m, then its power will be: |
1 D
0.5 D
1.5 D
1 D
|
| 10 |
The S.I unit of power of a lens is: |
Dioptre
Volt
Ampere
Watt
|
| 11 |
After refraction from a convex lens, rays of light parallel to the principal axis converge at a point, this point of convex lens is called: |
Principal focus
Pole
Focal length
Optical center
|
| 12 |
When light passes through a prism it deviates from its original path due to: |
Reflection
Diffraction
Interference
Refraction
|
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