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With the help of Newton’s disc, prove that seven colours of the rainbow can be recombined and produce white light
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0
|
1326
|
March 23, 2018
|
|
Explain the reflection of light on white paper screen with the help of an activity
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0
|
3146
|
March 23, 2018
|
|
Distinguish between the following. Real image and Virtual image ,Convergent beam and Divergent beam
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0
|
1781
|
March 23, 2018
|
|
You are given three mirrors of different types. How will you identify each one of them?
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0
|
5507
|
March 23, 2018
|
|
What is rectilinear propagation of light? How will you prove it?
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0
|
2524
|
March 23, 2018
|
|
What is regular and irregular reflection?
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0
|
4536
|
March 23, 2018
|
|
Suppose we wish to obtain the real image of a distant tree
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0
|
1778
|
March 23, 2018
|
|
It was observed that when the distance between an object and a lens decreases
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0
|
1797
|
March 23, 2018
|
|
Why should you not look at the sun through a convex lens?
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|
0
|
2002
|
March 23, 2018
|
|
What is a Newton’s disc?
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0
|
1114
|
March 23, 2018
|
|
State the characteristics of the image formed by a plane mirror
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0
|
1005
|
March 23, 2018
|
|
What is lateral inversion?
|
|
0
|
5179
|
March 23, 2018
|
|
Give one use each of a concave and a convex mirror
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|
0
|
4682
|
March 23, 2018
|
|
State two differences between a convex and a concave lens
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|
0
|
8627
|
March 23, 2018
|
|
What is a virtual image? Give one situation where a virtual image is formed
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|
0
|
1941
|
March 23, 2018
|
|
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop
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0
|
2319
|
March 23, 2018
|
|
Two different type of lenses are placed on a sheet of newspaper
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|
0
|
2921
|
March 23, 2018
|
|
An erect and enlarged image of an object is formed on a screen. Explain how this could be possible. [NCERT Exemplar] The image formed on the screen could be enlarged and erect if the object is placed upside down between F and 2F of the lens
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0
|
710
|
March 23, 2018
|
|
State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in figure
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0
|
2347
|
March 23, 2018
|
|
Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason
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0
|
1892
|
March 23, 2018
|
|
Observe the figures given below carefully
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|
0
|
1345
|
March 23, 2018
|
|
Find out the position of the image of an object situated at A in the plane mirror
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|
0
|
1370
|
March 22, 2018
|
|
Explain how you can take care of your eyes
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|
0
|
20084
|
March 22, 2018
|
|
Draw a labelled sketch of the human eye
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|
0
|
3882
|
March 22, 2018
|
|
Describe the construction of a Kaleidoscope
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0
|
5013
|
March 22, 2018
|
|
Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane
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0
|
14814
|
March 22, 2018
|
|
Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case
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|
0
|
10671
|
March 22, 2018
|
|
Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
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|
0
|
1580
|
March 22, 2018
|
|
Write down the names of parts of the eye marked in the figure given below
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|
0
|
1489
|
March 22, 2018
|
|
Boojho planned an activity to observe an object A through pipes as shown in figure below, so that he could see objects which he could not directly see
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0
|
11357
|
March 22, 2018
|