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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

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.

थोडक्यात उत्तर
स्पष्ट करा
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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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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Refraction of light - Write scientific reasons

संबंधित प्रश्‍न

  Column I Column II Column III
1 Dispersion Long-sightedness Twinkling of stars
2 Refraction Splitting of white light into component colours Convex lens
3 Hypermetropia Change in the direction of the ray of light due to change in medium Spectrum of seven colours

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?


Where is the image when you look at something in a mirror?


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


 An extended object in the form of an arrow pointing upward has been placed in front of a plane mirror. Draw a labelled ray-diagram to show the formation of its image.


The angle of reflection is equal to the angle of incidence:

(a) always
(b) sometimes
(c) under special conditions
(d) never


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 ______.


Name the phenomenon due to which a swimming pool appears less deep than it really is.


When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?


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


Fill in the following blank with suitable word:  

Light bends when is passes from water into air. We say that it is ............


Light travels more quickly through water than through glass. 

 Which is optically denser : water or glass? 

 


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


 Show the lateral displacement of the ray on the diagram. 


 State two factors on which the lateral displacement of the emergent ray depends. 


Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. State whether the bending of pencil will increase or decrease if water is replaced by another liquid which is optically more dense than water. Give reason for your answer.


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

 What is the angle of incidence?


How does the light have to enter the glass: 

 to produce a large amount of bending?


Light travels at a lower speed in water than in air.


Water is optically .......... than air.


When a ray of light travels from water to air, it bends ............. the normal.


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)


What is the cause of refraction of light when it passes from one medium to another?


A small air bubble in a glass block when seen from above appears to be raised because of ______.


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.


What is atmospheric reflection? Explain with the help of a labelled diagram that the position of a star as seen by us is not its true position. 


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 . 


Explain how the formation of a rainbow occurs.


The incident rays and refracting rays are on opposite sides of the normal.


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


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


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


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


Light travels fastest in a vacuum. Why?


A water tank appears shallower when it is viewed from the top due to refraction. 


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


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