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. - Science and Technology 1

Advertisements
Advertisements
Explain
Short Note

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.

Advertisements

Solution

  1. Light rays coming from the coin emerge out of water and change their direction due to the refraction of light.
  2. Hence, as soon as the water is poured into the pot to a certain level, the coin appears.
  Is there an error in this question or solution?
Chapter 6: Refraction of light - Write scientific reasons

APPEARS IN

RELATED QUESTIONS

What is refraction of light?


  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

 The image in a plane mirror is virtual and laterally inverted. What does this statement mean?


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


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


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


Fill in the following blank with suitable word: 

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


What is meant by 'refraction of light'? Draw a labelled ray diagram to show the refraction of light.


Light travels more quickly through water than through glass. 

If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal?


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.


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.


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


Air is optically .......... than glass.


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?


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)


Draw suitable diagrams to illustrate how a beam of light incident parallel to the principal axis is reflected by:
(a) a concave mirror, and (b) a convex mirror


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 ______.


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.


The laws of reflection hold true for:


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.

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.


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.

Numerical problems.

The speed of light in water is 2.25 × 108 ms–1. If the speed of light in vacuum is 3 × 108 ms–1, calculate the refractive index of water.


The refractive index of four substances A, B, C, and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in


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?


The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called ______.


Which object use the reflection of light?


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


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 ______.


The ratio of the sine of the angle of incidence to the sine of ______ is constant.


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


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.


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


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.


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 ______.


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


Share
Notifications



      Forgot password?
Use app×