|
A person is not able to see distinctly the object placed at large distances but is able to read the matter written on a book comfortably
|
|
1
|
1715
|
September 25, 2016
|
|
A person cannot see objects farther than 12 m from the eye clearly
|
|
1
|
4231
|
September 25, 2016
|
|
Explain why the colour of the clear sky is blue
|
|
0
|
10188
|
September 25, 2016
|
|
What is meant least distance of distinct vision?
|
|
1
|
11854
|
September 25, 2016
|
|
What is the far point and near point of a normal human eye?
|
|
1
|
1875
|
September 25, 2016
|
|
What is dispersion of light?
|
|
1
|
903
|
September 25, 2016
|
|
An old person is unable to see clearly nearby object as well as distant objects
|
|
1
|
6745
|
September 25, 2016
|
|
Explain how a normal human eye is able to see distinctly the object placed at a distance as well as those placed at a nearer distance
|
|
1
|
3296
|
September 25, 2016
|
|
Name the part of the eye where image is formed by the eye lens
|
|
1
|
6823
|
September 25, 2016
|
|
A person needs a lens of power - 2.5 dioptres for correcting his vision
|
|
1
|
9351
|
September 25, 2016
|
|
What is the least distance of distant vision for the normal eye?
|
|
1
|
4859
|
September 25, 2016
|
|
List two causes leading to myopia of the eye
|
|
1
|
5874
|
September 25, 2016
|
|
What is meant by least distance of distinct vision?
|
|
1
|
941
|
September 25, 2016
|
|
What is "power of accommodation of the eye"?
|
|
1
|
2163
|
September 25, 2016
|
|
Why does the sun appear reddish early in the morning?
|
|
1
|
17227
|
September 25, 2016
|
|
Draw a neat diagram to show the refraction of a light ray
|
|
1
|
3423
|
September 25, 2016
|
|
Why does it take sometimes to see objects in a cinema hall when we just enter the hall from bright sunlight?
|
|
1
|
3030
|
September 25, 2016
|
|
Why does it take sometimes to see the objects in a dim room when we enter the room from bright sunlight outside?
|
|
0
|
372
|
September 25, 2016
|
|
Why does the sky appear blue?
|
|
0
|
4438
|
September 25, 2016
|
|
Why do we observe the seven colours when white light passes through a glass prism?
|
|
1
|
2613
|
September 25, 2016
|
|
Describe the formation of rainbow in the sky
|
|
0
|
1150
|
September 25, 2016
|
|
Why do we observe difference in colours of the sun during sunrise, sunset and noon?
|
|
0
|
7742
|
September 25, 2016
|
|
Why does the clear sky appear blue?
|
|
1
|
4106
|
September 25, 2016
|
|
For which position of the object does a convex lens form a virtual and erect image?
|
|
1
|
8739
|
September 25, 2016
|
|
A 14 year old student is not able to see clearly the questions written on the blackboard placed at a distance of 5 m from him
|
|
1
|
18395
|
September 25, 2016
|
|
State two main causes of a person developing near sightedness
|
|
1
|
4723
|
September 25, 2016
|
|
How does the sky appear from the surface of the moon?
|
|
1
|
3460
|
September 25, 2016
|
|
Explain why, when the sun is overhead at noon, it appears white?
|
|
0
|
3373
|
September 25, 2016
|
|
Why does the sky appear dark and black to an astronaut instead of blue?
|
|
0
|
2195
|
September 25, 2016
|
|
What will be colour of the sky in the absence of atmosphere?
|
|
1
|
6189
|
September 25, 2016
|