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

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.

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

संबंधित प्रश्‍न

What is lateral inversion? Explain by giving a suitable example.


 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?


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.


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?

 


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


State two effects caused by the refraction of light.


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


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?


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


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


Light travelling from a denser medium to a rarer medium along a normal to the boundary:

(a) is refracted towards the normal
(b) is refracted away from the normal
(c) goes along the boundary
(d) is not refracted


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?


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


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


What do you understand by refraction of light?


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? 


A ray of light A incident from air suffers partial reflection and refraction at the boundary of water. 

  1. Complete the diagram showing (i) the reflected ray B and (ii) the refracted ray C.
  2. How are the angles of incidence i and refraction r related?

Write scientific reason.

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


Observe the given figure and name the following.

Ray AB  
Ray NM  
Ray MD  
∠ r  

Explain the working of a periscope.


Explain with diagrams how refraction of incident light takes place from

  1. rarer to denser medium
  2. denser to rarer medium
  3. normal to the surface separating the two media.

Assertion and reasoning type

  1. Assertion: If the refractive index of the medium is high (denser medium) the velocity of the light in that medium will be small
  2. Reason: Refractive index of the medium is inversely proportional to the velocity of the light

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 ______.


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


Which surface will not reflect most of the light falling on them?


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A star appears twinkling into the sky because of the reflection of light by the atmosphere.


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


Why a pencil partly immersed in water appears to be bent at the water surface.


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


A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show. the refraction of light in this case.


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


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