Observe the given figure and name the following. Ray AB, Ray NM, Ray MD, ∠ r - Science and Technology 1

Short Note

Observe the given figure and name the following.

Ray AB  
Ray NM  
Ray MD  
∠ r  


Ray AB Incident ray
Ray NM Refracted ray
Ray MD Emergent ray
∠ r Angle of refraction
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Chapter 6: Refraction of light - Solve the following 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

Where is the image when you look at something in a 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 ______.

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

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.

When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?

 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.

Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. State whether the bending of pencil will increase or decrease if water is replaced by another liquid which is optically more dense than water. Give reason for your answer.

Water is optically denser than glass.

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.

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

When a ray of light travels from water to air, 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 ______.

Choose and write the correct option.

If we gradually increase the angle of incidence of a ray of light passing through prism then …..

The size of image of an object by a convex lens of focal length 20 cm is observed to be reduced to  `1/3` rd of its size . Find the distance of the object from the optical centre of the lens . 

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.

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

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 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.

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

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?

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 ______.

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.

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?

Under what circumstances there won’t be any refraction of light when it enters from one medium to another?

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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