हिंदी

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

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प्रश्न

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

विकल्प

  •  Reflection of light

  • Refraction of light

  • Dispersion of light

  • Absorption of light

MCQ
रिक्त स्थान भरें
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उत्तर

We can see the Sun even when it is little below the horizon because of refraction of light.

Explanation:

We can see the Sun even when it is a little below the horizon because of atmospheric refraction. The Earth’s atmosphere bends the light from the Sun upwards towards the eye of the observer. Even though the Sun itself might be just below the horizon line, the light is refracted or bent by the atmosphere, thus making the Sun appear to be visible.

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अध्याय 6: Refraction of light - Exercise [पृष्ठ ७९]

संबंधित प्रश्न

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.


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


A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?


Write the word AMBULANCE as it would appear when reflected in a plane mirror. Why is it sometimes written in this way (as its mirror image) on the front of an ambulance?


What type of reflection of light takes place from a cinema screen?


A man stands 10 m in front of a large plane mirror. How far must the walk before he is 5 m away from his image?


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?

 


A ray of light goes from water into air. Will it bend towards the normal or away from the normal?


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?


As light rays pass from water into glass, are they refracted towards the normal or away from the normal?


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


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


A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.


 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. 


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

  1. What is the angle of incidence?
  2. What is the angle of refraction?

Water is optically denser than glass.


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


The speed of light is more in glass than in water.


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


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


What do you understand by refraction of light?


The diagram (figure) given below shows two parallel rays 1 and 2 incident on (a) a concave mirror, (b) a convex mirror. Draw the reflected rays and mark the focus by the symbol F.


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. 


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. 


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?


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


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

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 from air to glass at the point O on the hemispherical glass slab is.


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


Light travels fastest in a vacuum. Why?


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


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


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


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