| 1. | One cannot see through the fog, because ? | |
|
light is scattered by the droplets
|
||
|
fog absorbs light
|
||
|
light suffers total reflection at droplets
|
||
|
refractive index of the fog is very high
|
||
View Answer
Discuss in Forum
Report Question| 2. | The air layer of atmosphere whose temperature is less then the hot layer behave as optically ? | |
|
inactive medium
|
||
|
rarer medium
|
||
|
denser medium
|
||
|
either denser or rarer medium
|
||
| 3. | Myopia and hypermetropia can be corrected by ? | |
|
Plano-concave lens for both defects.
|
||
|
Convex and concave lens
|
||
|
Concave and convex lens
|
||
|
Concave and plano-convex lens
|
||
| 4. | The Animals called predators have ? | |
|
Both the eyes at the front
|
||
|
One eye on the front and one at the back
|
||
|
One eye on the side and one at the front
|
||
|
Both the eyes on the sides
|
||
| 5. | The defect of the eye in which the eyeball becomes too long is ? | |
|
cataract
|
||
|
presbyopia
|
||
|
hypermetropia
|
||
|
myopia
|
||
| 6. | Image formed in normal eye of human is ? | |
|
beyond retina
|
||
|
at infinity
|
||
|
on retina
|
||
|
behind retina
|
||
| 7. | Long sightedness is caused by eyeball being too short. It can be corrected by ? | |
|
Divergent lens
|
||
|
None
|
||
|
Using convergent lens
|
||
|
Plane mirror
|
||
| 8. | The focal length of the eye lens increases when eye muscles ? | |
|
Contract and lens becomes thinner
|
||
|
Are relaxed and lens becomes thicker
|
||
|
Are relaxed and lens become thinner
|
||
|
Contract and lens becomes thicker
|
||
| 9. | How does the eye change in order to focus on near or distant objects ? | |
|
The pupil gets larger or smaller
|
||
|
The lens becomes thicker or thinner
|
||
|
The retina moves in or out
|
||
|
The lens moves in or out
|
||
| 10. | At a particular minimum value of angle of deviation, the refracted ray becomes ? | |
|
Inclined at 45degrees w.r.t base of prism
|
||
|
Perpendicular to base of prism
|
||
|
None
|
||
|
Parallel to base of prism
|
||