light-shadows-and-reflectionsWHERE cd.courseId=10 AND cd.subId=16 AND chapterSlug='light-shadows-and-reflections' and status=1SELECT ex_no,page_number,question,question_no,id,chapter,solution FROM question_mgmt as q WHERE courseId='10' AND subId='16' AND chapterId='164' AND ex_no!=0 AND status=1 ORDER BY ex_no,CAST(question_no AS UNSIGNED) CBSE Class 6 Free NCERT Book Solution for Science

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Chapter 11 : Light, Shadows and Reflections


  • Objects around us are of different types.
  • Some are opaque, transparent, translucent, luminous, non- luminous around us.
  • The objects which emits light are called as luminous whereas, which does not emit light are known as non- luminous objects.
  • The object in which the light can pass easily called as transparent whereas the objects from which lights can pass easily but we cannot see clearly are known as translucent objects.
  • The objects through which lights cannot pass are called as opaque objects.
  • When an object comes in the path of light then the dark structure is formed, called as shadow.
  • Reflection may be defined as, when an objects send light back to its path, then an image is formed is known as reflection. For example: image in the mirror, shadow in water etc.
  • Bright objects or images can be seen by a pinhole camera. It is made up of cardboard simply.
  • Light travels in the straight line, that’s why when any object comes in its path, it makes shadow.

Exercise 1 ( Page No. : 114 )
Q:
A:

boxes arrangements

The objects from which light cannot pass through, are called opaque objects. When any opaque object comes in the path of light, then a dark structure is formed called shadow.


Exercise 1 ( Page No. : 114 )
Q:
A:

Opaque: A piece of rock, a CD, smoke, iron, an umbrella, a wall, a sheet of aluminium.

Transparent: Air, water, sheet of plane glass.

Translucent: A sheet of polythene, fog, a sheet of cellophone.

Luminous: A lightened fluorescent tube, flame of gas burner, a lighted torch, firefly, stove, sun, moon.

Non- luminous: A mirror, piece of rock, a wire mesh, iron, a wall.

  • The objects through which lights cannot pass are called as opaque objects.
  • Objects from which lights can pass easily and we can see clearly through them are called transparent objects.
  • The objects from which lights can pass easily but we cannot see clearly are known as translucent objects.
  • The objects which emits light are called as luminous.
  • The objects which does not emit light are known as non- luminous objects.

Exercise 1 ( Page No. : 114 )
Q:
A:

Yes, a cylindrical shape is one which gives the circular shadow from one end and a rectangular shadow from another end.

shapes


Exercise 1 ( Page No. : 114 )
Q:
A:

No, in a complete dark room we cannot see the reflection in the mirror because reflection is the phenomenon of light. If there is no light then reflection does not occur there and we cannot see our image in the mirror.


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