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Maharashtra State BoardSSC (English Medium) 10th Standard

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

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Question

Write scientific reason.

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

Answer in Brief
Explain
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Solution

  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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Chapter 6: Refraction of light - Write scientific reasons

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  1. How would its image look like when seen in a plane mirror?
  2. What is the name of the phenomenon involved?

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


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


 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.


 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.


 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.


 Write all the capital letters of the alphabet which look the same in a plane mirror.


A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is ______.


If a ray of light goes form a denser medium to a rarer medium, will it bend towards the normal or away from the normal?


State two effects caused by the refraction of light.


A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it?


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


Which phenomenon of light makes the water to appear shallower than it really is?


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?


Light travels more quickly through water than through glass.

  1. Which is optically denser: water or glass?
  2. If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal?

  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.
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 for no refraction to happen? 


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


What do you understand by refraction of light?


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


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? 


Define the principal focus of a concave mirror.


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List in proper sequence the steps of the experiment for determining the approximate focal length of a given concave mirror by obtaining the image of a distant object.


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Identify the wrong figure from the following.


Write scientific reason.

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


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?


A ray of light traveling in medium 1 strikes and travels into another transparent medium 2. If the speed of light is greater in medium 1, the ray will ______.


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


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


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