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Write scientific reason. A pencil appears to be broken near the surface of water.

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प्रश्न

Write scientific reason.

A pencil appears to be broken near the surface of water.

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उत्तर

  1. When one look at the portion of the pencil that is inside the water, light travels from water to air via glass.
  2. This light ray changes the medium and undergoes refraction.
  3. As a result, the pencil inside the water appears to be broken near the surface of water.
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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Refraction of light - Write scientific reasons [पृष्ठ २४]

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
अध्याय 6 Refraction of light
Write scientific reasons | Q 4. | पृष्ठ २४

संबंधित प्रश्न

What is refraction of light?


State whether the following statement is true of false:
A student says that we can see an object because light from our eyes is reflected back by the object.


What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?


 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?


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.


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.


The image formed by a plane mirror is :

(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real, at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.


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


An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the positions of the original and final images seen in the mirror is ______.


A man sits in an optician's chair looking into  plane mirror which is 2 m away from him and views the image of a chart which faces the mirror and is 50 cm behind his head. How far away from his eyes does the chart appear to be?

 


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


What is meant by ‘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?


 Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.


  1. 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.
  2. Show the lateral displacement of the ray on the diagram.

When a ray of light travelling in glass enters into water obliquely ______.


How does the light have to enter the glass: 

 to produce a large amount of bending?


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


Air is optically .......... than glass.


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? 


We can see the sun even when it is little below the horizon because of ______.


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 laws of reflection hold true for ______.


Due to _______ pencil looks bent in water, in the given experiment.


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


Write scientific reason.

The bottom of a pond appears raised.


Observe the given figure and write appropriate phenomenon of light in the box.


Explain the working of a periscope.


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


What is refractive index?


You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?


The angle of incidence for a ray of light having zero reflection angle is ______.


In the above diagram light is travelling through different media. It is noted by a scientist that ∠1= ∠3 = ∠4 but ∠2 < ∠1. Which of the following statement would be correct?


The phenomenon of light passing through the object is called ______.


The bending of light as it passes from one medium to another is called ______.


Which is optically denser out of the two medium M1& M2 having the refractive indices = 1.71 and 1.36 respectively?


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