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Jyeshtha
Subject: Science
, asked on 16/1/18
How are infinite images are formed between 2 parallel mirrors?
Answer
2
Ananya Choudhury
Subject: Science
, asked on 16/1/18
Q. Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30
°
as shown in Fig. 116.19. Draw the reflected ray from the second mirror.
Answer
1
Tiasha Chakraborty
Subject: Science
, asked on 14/1/18
In a kaliedoscope various patterns are seen. What is the principle involved in this ?
Answer
1
Sikha Nath
Subject: Science
, asked on 11/1/18
disorders of human eye
Answer
1
Tiasha Chakraborty
Subject: Science
, asked on 9/1/18
20. Bats can ascertain distances, directions, nature and size of obstacles without eyes. How?
21. The town hall building is situated close to Rahul's house. There is a clock on the top of the town hall building which rings the bell every hour. Rahul has noticed that the sound of the clock appears to be much clearer at night. Explain.
Answer
2
Sandipan
Subject: Science
, asked on 9/1/18
What is dispersing prism?Explain very briefly.
Answer
2
Sandipan
Subject: Science
, asked on 9/1/18
What is recombination prism.?Explain very briefly.
Answer
1
Kartik Raj
Subject: Science
, asked on 4/1/18
Why can’t we use water to put off the fire at petrol pump? What kind of arrangements are available to extinguish fire at a petrol pump?
Answer
3
Kartik Raj
Subject: Science
, asked on 4/1/18
Distinguish between near point and far point of eye?
Answer
2
Kartik Raj
Subject: Science
, asked on 4/1/18
What happens to the size of the pupil of our eye: (a) in dim light? (b) in bright light?
Answer
5
Kartik Raj
Subject: Science
, asked on 4/1/18
How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another? {a} 120 {b} 45 {c} 180 {d} 60 {e} 90
Answer
3
Kartik Raj
Subject: Science
, asked on 4/1/18
Draw a labeled diagram showing how a plane mirror forms an image of a point object placed in front of it.
Answer
2
Kartik Raj
Subject: Science
, asked on 4/1/18
The eye is a remarkable organ. Its working is similar to photographic camera. Compare and write the similarities and dissimilarities between them.
Answer
3
Kartik Raj
Subject: Science
, asked on 4/1/18
What is Night blindness? How can it be cured?
Answer
4
Kartik Raj
Subject: Science
, asked on 4/1/18
Take a glass strip. Clean it and put it on white sheet of paper. See yourself in the glass. Next put the glass strip on a black sheet of paper. Again look into the glass. In which case do you see yourself better and why?
Answer
2
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21. The town hall building is situated close to Rahul's house. There is a clock on the top of the town hall building which rings the bell every hour. Rahul has noticed that the sound of the clock appears to be much clearer at night. Explain.