Class 6 Exam  >  Class 6 Notes  >  Science Class 6  >  NCERT Summary: Light, Shadow & Reflection

NCERT Summary: Light, Shadow & Reflection | Science Class 6 PDF Download

Light

  • It is a form of energy which is responsible for seeing objects.
  • When light falls on an object, some light get reflected, this reflected light come to our eyes and we are able to see an object.
  • Example: sun, torch, candle, fireflies and glow worm etc.

Sources of light

  • Luminous object: The objects which emit their own light is called luminous object.
    Example: sun, torch bulb, star
  • Non-luminous object: The objects which do not emit their own light is called non-luminous object.
    Example: Moon, shoe, trees.

Types of materials transmit light

There are three types of materials which transmit light:

  • Transparent
  • Translucent
  • Opaque

1. Transparent

  • These objects allow light to pass through them in straight line completely.
  • We can see through these objects clearly.
  • Examples: air, water, etc.

2. Translucent

  • These objects allow light to pass through them partially.
  • The object is not clearly seen in translucent object.
  • Examples: Tissue paper, frosted glass, butter paper, etc.

3. Opaque

  • These objects do not allow light to pass through them.
  • We can’t see the object through this.
  • Examples: wall, door, trees etc.

Characteristics of light

  • Light travels in straight line
  • Light can be reflected
  • Light can be bent
  • The speed of light is 3 × 108 m/sec
  • Light can be polarized

Shadow

  • When an opaque object blocked the path of light it forms a dark portion on the opposite side of the object this dark portion is known as shadow.

Properties of shadow

  • The object must be opaque or translucent
  • Transparent object do not make shadow
  • It is dark in color
  • It is formed opposite to the source of light
  • It gives the information about the shape of object
  • Size of shadow can be increase or decrees by change in distance between object and screen are changed.

Pin hole camera

  • It is a toy device use to study light travels in straight line

Properties of image formed by a Pin Hole Camera

  • Image formed by a pin hole camera is coloured.
  • Image formed by a pin hole camera is inverted.
  • Image formed by a pin hole camera is smaller in size.

Rectilinear propagation of light

  • Light travels in a straight line are called rectilinear propagation of light.

Important terms regard rectilinear propagation of light

  • Ray of light: It is a path along which light travels in the given direction.
  • Beam of light: Bunch of ray of light travel in the given direction.

Mirror

  • A mirror is a polished surface which can make the image of an object.

Types of Mirror

  • Plane mirror: Image formed is of the same size
  • Concave mirror: Reflecting surface is bent–in.
  • Convex Mirror: Reflecting surface is bulged-out.

Reflection

  • When light falls on a mirror, light wave may change their direction upon the striking surface this phenomena is called reflection.
The document NCERT Summary: Light, Shadow & Reflection | Science Class 6 is a part of the Class 6 Course Science Class 6.
All you need of Class 6 at this link: Class 6
99 videos|260 docs|49 tests

Top Courses for Class 6

FAQs on NCERT Summary: Light, Shadow & Reflection - Science Class 6

1. What is light?
Ans. Light is a form of energy that allows us to see objects. It is a type of electromagnetic radiation that travels in waves.
2. What is a shadow?
Ans. A shadow is a dark area formed when an object blocks the path of light. It is formed when light is partially or completely blocked by an opaque object.
3. How does light travel?
Ans. Light travels in straight lines until it encounters an object or surface. It can travel through transparent objects such as air and water, but gets absorbed or reflected by opaque objects.
4. What is reflection of light?
Ans. Reflection of light is the bouncing back of light rays when they strike the surface of an object and cannot pass through it. The angle of incidence, which is the angle at which the light strikes the surface, is equal to the angle of reflection.
5. How does a mirror work?
Ans. A mirror works by reflecting light. It has a smooth surface that allows light to bounce off it in a predictable way. When light rays from an object strike a mirror, they bounce off and form an image.
99 videos|260 docs|49 tests
Download as PDF
Explore Courses for Class 6 exam

Top Courses for Class 6

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

ppt

,

shortcuts and tricks

,

past year papers

,

Exam

,

study material

,

Important questions

,

NCERT Summary: Light

,

practice quizzes

,

MCQs

,

Semester Notes

,

Shadow & Reflection | Science Class 6

,

Viva Questions

,

video lectures

,

mock tests for examination

,

Previous Year Questions with Solutions

,

Shadow & Reflection | Science Class 6

,

Free

,

Shadow & Reflection | Science Class 6

,

pdf

,

Objective type Questions

,

NCERT Summary: Light

,

NCERT Summary: Light

,

Sample Paper

,

Extra Questions

,

Summary

;