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Write scientific reason. The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears.

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प्रश्न

Write scientific reason.

The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears.

कारण बताइए
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उत्तर

  1. Light rays coming from the coin emerge out of water and change their direction due to the refraction of light.
  2. Hence, as soon as the water is poured into the pot to a certain level, the coin appears.
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अध्याय 6: Refraction of light - Write scientific reasons

संबंधित प्रश्न

Name the phenomenon responsible for the following effect:
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If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image?


Which property of light makes a pencil cast a shadow when it is held in front of a light source?


 Which type of reflection of light leads to the formation of images?


 A boy with a mouth 5 cm wide stands 2 m away from a plane mirror. Where is his image and how wide is the image of his mouth?


 State the uses of plane mirrors.


What is meant by 'reflection of light'?


The figure given alongside shows the image of a clock as seen a plane mirror. The correct time is:
Figure

(a) 2.25
(b) 2.35
(c) 6.45
(d) 9.25


A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is ______.


Explain how to read the following message which was found on some blotting paper:


In which material do you think light rays travel faster-glass or air?


State whether the following statement is true or false:
Refraction occurs because light slows down in denser materials.


Fill in the following blank with suitable word: 

Light travelling along a normal is ...............refracted.


What is meant by 'refraction of light'? Draw a labelled ray diagram to show the refraction of light.


A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Draw a labelled ray diagram to show the completer path of this ray of light. Mark the two points where the refraction of light takes place. What can you say about the final direction of ray of light?


Light travels more quickly through water than through glass. 

If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal?


With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray.


Water is optically denser than glass.


A ray of light when passes from glass to air, bends towards the normal.


Image is formed by a mirror due to refraction of light.


Draw suitable diagrams to illustrate how a beam of light incident parallel to the principal axis is reflected by:
(a) a concave mirror, and (b) a convex mirror


A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it. 


Choose and write the correct option.

If we gradually increase the angle of incidence of a ray of light passing through prism then …..


Define the principal focus of a concave mirror.


The phenomenon of change in the direction of light when it passes from one transparent medium to another is called ___________.


A real image is formed by the light rays after reflection or refraction when they:

  1. actually meet or intersect with each other.
  2. actually converge at a point.
  3. appear to meet when they are produced in the backward direction.
  4. appear to diverge from a point.

Which of the above statements are correct?


Write scientific reason.

The sun appears on the western horizon for some time after sunset.


Write scientific reason.

The bottom of a pond appears raised.


State whether true or false. If false, correct the statement.

The angle of deviation depends on the refractive index of the glass.


Why does a ray of light bend when it travels from one medium to another?


Numerical problems.

The speed of light in water is 2.25 × 108 ms–1. If the speed of light in vacuum is 3 × 108 ms–1, calculate the refractive index of water.


What is refractive index?


Light bends as it passes from one medium to another. What is this phenomenon called?


A ray of light traveling in medium 1 strikes and travels into another transparent medium 2. If the speed of light is greater in medium 1, the ray will ______.


Mirage is an example of refraction and the total internal reflection of light.


Assertion: The air bubble shines in water.
Reason: Air bubble shines due to the refraction of light.


How do twinkling stars occur? (or) what is the cause of the twinkling of stars?


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