In the given figure, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism it produces a spectrum XY on a screen
|
|
2
|
17533
|
December 8, 2019
|
(a) A student suffering from myopia is not able to see distinctly the objects placed beyond 5m
|
|
1
|
1102
|
April 3, 2019
|
(a) Draw a ray diagram to explain the term angle of deviation
|
|
1
|
18172
|
April 3, 2019
|
1. Which defect of vision is Akshay suffering from? Which type of lens is used to correct this defect
|
|
1
|
1655
|
April 3, 2019
|
(i) defect of vision and also
|
|
1
|
1278
|
April 3, 2019
|
(a) What is dispersion of white light. What is the cause of such dispersion
|
|
1
|
1555
|
April 3, 2019
|
Why is the normal eye unable to focus on an object placed within 10 cm from the eye?
|
|
1
|
1969
|
April 3, 2019
|
(a) Give reason for the following: (i) Colour of the clear sky is blue
|
|
1
|
1743
|
April 3, 2019
|
Name the four common defects of vision and state the cause of each defect
|
|
1
|
850
|
April 3, 2019
|
1. Name the defect of vision he is suffering from
|
|
1
|
2430
|
April 3, 2019
|
1. Explain how we see different colours of an object
|
|
1
|
2365
|
April 3, 2019
|
State the cause of dispersion of white light passing through a glass prism
|
|
1
|
3186
|
April 3, 2019
|
What is meant by scattering of light?
|
|
1
|
13048
|
April 3, 2019
|
With the help of a labelled diagram, explain why the Sun appears reddish at the Sun-rise and the sun-set
|
|
1
|
6033
|
April 3, 2019
|
Why does the Sun seem to rise two minutes before the actual sunrise
|
|
1
|
2608
|
April 3, 2019
|
Explain giving reason why the sky appears blue to an observer from the surface of the earth?
|
|
1
|
822
|
April 3, 2019
|
State the difference in colour of the sun observed during sunrise/sunset and noon. Give explanation for each
|
|
1
|
1554
|
April 3, 2019
|
An old man cannot see objects closer than lm from the eye clearly
|
|
1
|
1378
|
April 3, 2019
|
Explain why the planets do not twinkle but the stars twinkle
|
|
1
|
2810
|
April 3, 2019
|
With the help of an activity show the blue colour of the sky and the reddish appearance of the sun at the sunrise or sunset
|
|
0
|
6661
|
March 17, 2018
|
What is dispersion of white light? What is the cause of dispersion? Draw a diagram to show the dispersion of white light by a glass prism
|
|
0
|
33297
|
March 17, 2018
|
What is myopia? State the two causes of myopia
|
|
0
|
24906
|
March 17, 2018
|
What is hypermetropia? Write two causes for development of this defect
|
|
0
|
8935
|
March 17, 2018
|
State the function of each of the following parts of the human eye:
|
|
0
|
2169
|
March 17, 2018
|
How are we able to see nearby and also distant objects clearly?
|
|
0
|
1937
|
March 17, 2018
|
A person needs a lens of power - 4.5 D for correction of her vision
|
|
0
|
3172
|
March 17, 2018
|
How does atmospheric refraction affect sunrise and sunset?
|
|
0
|
4014
|
March 17, 2018
|
Describe the formation of rainbow in the sky with the help of a diagram
|
|
0
|
4595
|
March 17, 2018
|
What is Tyndall effect? Explain with an example
|
|
0
|
6194
|
March 17, 2018
|
Why is the colour of sky blue?
|
|
0
|
1556
|
March 17, 2018
|