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Write scientific reason. The bottom of a pond appears raised. - Science and Technology 1

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प्रश्न

Write scientific reason.

The bottom of a pond appears raised.

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उत्तर

  1. The rays of light coming from the bottom of a pond bend away from the normal as they travel from water (denser medium) to air (rarer medium).
  2. Hence, they appear to come from a point above the actual point from which they come. Therefore, the bottom of the pond appears raised.
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अध्याय 6: Refraction of light - Write scientific reasons

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संबंधित प्रश्न

What is refraction of light?


Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, if appears in the mirror that we are writing with the left hand.


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


The letter F is placed in front of a plane mirror: 

 How would its image look like when seen in a plane mirror?


A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light? 


The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?


 State the uses of plane mirrors.


Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram: 

(a) Incident ray
(b) Point of incidence
(c) Normal
(d) Reflected ray
(e) Angle of incidence
(f) Angle of reflection


With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.


 Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of 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.


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


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


What is meant by the 'angle of incidence' and the 'angle of refraction' for a ray of light?


Light travels more quickly through water than through glass. 

 Which is optically denser : water or glass? 

 


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.


A vertical ray of light strikes the horizontal surface of some water: 

What is the angle of refraction? 


How does the light have to enter the glass: 

 for no refraction to happen? 


What do you understand by refraction of light?


Draw a diagram showing the refraction of a light ray from water to glass. Label on it the incident ray, the angle of incidence (/), and the angle of refraction (r)


A ray of light passes from medium 1 to medium 2. Which of the following quantities of the refracted ray will differ from that of the incident ray: Speed, intensity, frequency, wavelength? 


Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s−1.


The size of image of an object by a convex lens of focal length 20 cm is observed to be reduced to  `1/3` rd of its size . Find the distance of the object from the optical centre of the lens . 


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


Light changes its direction when going from one transparent medium to another transparent medium. This is called _______.


Identify the wrong figure from the following.


The refractive index of four substances A, B, C, and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in


If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?


The angle of incidence from air to glass at the point O on the hemispherical glass slab is.


When light passes from one medium to another the ray gets bent. This property of light is called ______.


Light is refracted or bent while going from one medium to another because of its ______ changes.


In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.


When a ray of light travels normal to the given surface, then the angle of refraction is ______.


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