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Siddhi
Subject: Science
, asked on 12/3/18
How is astigmatism corrected
Answer
1
Payal Arora
Subject: Science
, asked on 7/3/18
Which of the two - angle of prism or angle of refraction (in a glass prism) is one of the factors on which angle of deviation depends ?
Answer
2
Aditi Sharma
Subject: Science
, asked on 6/3/18
Is angle of emergence = angle of incidence in refraction through glass prism?
Answer
1
Raghav Singh
Subject: Science
, asked on 3/3/18
Q. What is the angle of emergence of a prism ? It the emergent ray makes an angles of 45
°
with the second refracting surface of the prism?
Answer
1
Raghav Singh
Subject: Science
, asked on 3/3/18
Please tell why sulphur particles will scatter small wavelength from a large wavelength emergent ray only. Why any small wavelength emergent ray cant be fully scattered by sulphur.
Answer
2
Raghav Singh
Subject: Science
, asked on 3/3/18
In question 19 do I have to write simply about the eye cant accommodate less than 25 cm as its least point of distinct vision... or any other reason.
Q.19. Why is normal eye is not able to see clearly the objects kept closer than 25 cm? Explain in brief.
Answer
1
Raghav Singh
Subject: Science
, asked on 3/3/18
If amplitude is the displacement between two points on a wave then why the left on is incorrect and right one is correct?
Answer
1
Raghav Singh
Subject: Science
, asked on 3/3/18
Please answer question 23 and tell if my answer for 24 is correct or not.
23.
When a light ray passes obliquely through the atmosphere in an upward direction, how does its path
generally change?
CBSE 2011
24.
What will be the angle of deviation through a prism angle 60
°
, when angles of incidence and emergence
are 45
°
each?
Ans.
30
°
Answer
2
Raghav Singh
Subject: Science
, asked on 3/3/18
Please check if my answer is correct or not.
Q31. A boy uses spectacles of focal length – 60 cm. Name the defect vision he is suffering from. Which lens is used for the correction of this defect? Compute the power of this lens.
Q32. The power of a lens is + 1.5 D. Name the type of defects of vision that can be corrected by using this lens. Find the focal length of the lens.
Q33. If far point of eye lens is 10 m, find power of the lens required to correct the defect.
Answer
1
Raghav Singh
Subject: Science
, asked on 3/3/18
Please check if these answers are correct and if not, then why?
39. How many pins should be taken to trace the path of rays through a prism?
A: 4
40. In i-
δ
graph, what does i and
δ
indicate?
A: Angle of incidence and angle of deviation
41. Why does a ray of light bend towards the base when it passes through a glass prism?
A: Due to decrease in speed.
Answer
3
Raghav Singh
Subject: Science
, asked on 2/3/18
Does twinkling of stars and change in position of stars take place at the same time ?
Answer
2
Raghav Singh
Subject: Science
, asked on 2/3/18
In this take a look at bottom left and top right. Two differenet diagrams of dispersion of light is there. Which one is correct ?
Answer
1
Raghav Singh
Subject: Science
, asked on 2/3/18
Why 1/infinity =0?
Answer
2
Payal Arora
Subject: Science
, asked on 1/3/18
Q.24. Four students A, B, C, D perform experiment on tracing the path of light ray through a glass prism. The position of the pins used to describe incident ray is shown on paper by four of them, respectively as follows :
Choose the correct result from above figures. Redraw the diagram showing incident ray.
Answer
1
Raghav Singh
Subject: Science
, asked on 28/2/18
Where can we see a different position of star due to refraction? At horizon? Does this mean that at the other parts of earth this phwnomenon can't be seen? Please explain.
Answer
1
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What are you looking for?
Q.19. Why is normal eye is not able to see clearly the objects kept closer than 25 cm? Explain in brief.
23. When a light ray passes obliquely through the atmosphere in an upward direction, how does its path
generally change? CBSE 2011
24. What will be the angle of deviation through a prism angle 60, when angles of incidence and emergence
are 45 each?
Ans. 30
Q31. A boy uses spectacles of focal length – 60 cm. Name the defect vision he is suffering from. Which lens is used for the correction of this defect? Compute the power of this lens.
Q32. The power of a lens is + 1.5 D. Name the type of defects of vision that can be corrected by using this lens. Find the focal length of the lens.
Q33. If far point of eye lens is 10 m, find power of the lens required to correct the defect.
39. How many pins should be taken to trace the path of rays through a prism?
A: 4
40. In i- graph, what does i and indicate?
A: Angle of incidence and angle of deviation
41. Why does a ray of light bend towards the base when it passes through a glass prism?
A: Due to decrease in speed.
Choose the correct result from above figures. Redraw the diagram showing incident ray.