What is refraction of light? - Science and Technology 1

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Short Note

What is refraction of light?

What is refraction of light? Explain with the help of example.

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Solution

  1. Light changes its direction when going from one transparent medium to another transparent medium. This is called the refraction of light.
  2. e.g. The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears. This is because light rays coming from the coin emerge out of the water and change their direction due to the refraction of light.
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Chapter 6: Refraction of light - Solve the following Questions

RELATED QUESTIONS

  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

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?


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


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


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


State whether the following statement is true or false:
Refraction occurs because light slows down in denser materials.


Fill in the following blank with suitable word: 

Light travelling along a normal is ...............refracted.


How does the light have to enter the glass: 

 to produce a large amount of bending?


Water is optically denser than glass.


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


The depth of a pond when seen from above appears to be less.


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


Image is formed by a mirror due to refraction of light.


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


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.


Match the Following

Column A Column B 
(a) white Light  (1) Convex mirror
(b) Refraction (2) Concave mirror
(c) Virtual images  (3) refraction
(d) Real images  (4)  spectrum
(e) Prism (5) ray of light from glass to air 

What do you understand by refraction of light?


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. 


State the Snell’s laws of refraction of light.


Fill in the blank and Explain the completed sentences.

 The change in ______ of light rays while going from one medium to another is called refraction.


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


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.


The phenomenon of change in the direction of light when it passes from one transparent medium to another is called ___________.


Explain how the formation of a rainbow occurs.


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


Lights of different colours are used as signal for safety transport. From these, the wavelength of red light is _______ nm.


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


Identify the wrong figure from the following.


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


The speed of light varies in different media.


Write scientific reason.

The sun appears on the western horizon for some time after sunset.


Write scientific reason.

The bottom of a pond appears raised.


Write scientific reason.

The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears.


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  

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


Explain the working of a periscope.


State whether true or false. If false, correct the statement.

The angle of deviation depends on the refractive index of the glass.


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The refractive index of a transparent medium is always greater than ______.


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?


Which object use the reflection of light?


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


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


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


How does the light travel?


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


Light travels fastest in a vacuum. Why?


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


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 ______.


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


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


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


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?


Match the following:

  Column I   Column II
1. r > 90 a. Light gazes at the surface of separation between the two modes.
2. r = 90 b. No refraction.
3. r < 90 c. Refracted ray away from the normal

The bottom of swimming pool appears to be less deep than the actual one because of


In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.


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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