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State two main causes of a person developing near sightedness
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|
1
|
4780
|
September 25, 2016
|
|
How does the sky appear from the surface of the moon?
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1
|
3493
|
September 25, 2016
|
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Explain why, when the sun is overhead at noon, it appears white?
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0
|
3411
|
September 25, 2016
|
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Why does the sky appear dark and black to an astronaut instead of blue?
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0
|
2242
|
September 25, 2016
|
|
What will be colour of the sky in the absence of atmosphere?
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1
|
6243
|
September 25, 2016
|
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Why is the colour of the sky blue?
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0
|
15844
|
September 25, 2016
|
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Discuss why the sun is visible before actual sunrise and after actual sunset
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0
|
5931
|
September 25, 2016
|
|
What is a rainbow? Discuss how a rainbow is formed
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0
|
564
|
September 25, 2016
|
|
Describe an experiment to discuss the recombination of dispersed light
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0
|
6676
|
September 25, 2016
|
|
List four common defects of vision that can be corrected with the use of spectacles
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|
0
|
1017
|
September 25, 2016
|
|
What is colour blindness?
|
|
0
|
5301
|
September 25, 2016
|
|
Why does the sun appear bigger and seems to possess an oval shape during sunrise and sunset?
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0
|
1186
|
September 25, 2016
|
|
Which colour has five maximum wavelength and which has the minimum wavelength
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|
1
|
907
|
September 25, 2016
|
|
What is meant by spectrum of white light?
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0
|
7158
|
September 25, 2016
|
|
Define dispersion of white light and name the colours of white light in order
|
|
0
|
1296
|
September 25, 2016
|
|
Why do we have two eyes for vision and not just one?
|
|
0
|
16221
|
September 25, 2016
|
|
Explain the following terms connected with the eye
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|
1
|
3778
|
September 25, 2016
|
|
What are hypermetropia and myopia?
|
|
1
|
7188
|
September 25, 2016
|
|
A child sitting in a classroom is not able to read clearly the writing on the blackboard
|
|
1
|
2034
|
September 25, 2016
|
|
Draw a ray diagram showing the path of rays of light when it enters with oblique incidence
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|
1
|
17404
|
September 25, 2016
|
|
Under what condition in an arrangement of two plane mirrors
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1
|
10300
|
September 24, 2016
|
|
How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm
|
|
1
|
15288
|
September 24, 2016
|
|
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens
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|
1
|
20161
|
September 24, 2016
|
|
A convex lens of focal length 20 cm can produce a magnified virtual as well as real image
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|
1
|
15790
|
September 24, 2016
|
|
Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself ? Explain using a diagram
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|
0
|
20267
|
September 24, 2016
|
|
Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case
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|
1
|
11116
|
September 24, 2016
|
|
Figure below shows a lens treated as a combination of two prisms and a glass block
|
|
1
|
2708
|
September 24, 2016
|
|
Copy the given figure and complete it to show the formation of the image of the object AB
|
|
1
|
1531
|
September 24, 2016
|
|
In figure given below
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|
1
|
1415
|
September 24, 2016
|
|
Copy the figure and show the image formation with the help of rays
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|
1
|
750
|
September 24, 2016
|