Science NCERT Grade 6, Chapter 11, Light, Shadows and Reflections as the name suggests, talks about the basics of light and its associated concepts. The chapter begins with an explanation of luminous and non-luminous objects which is explained along with examples. The first section of the chapter- Light, Shadows and Reflections differentiates between transparent, opaque and translucent objects and defines each term along with suitable examples, activities and images. The next section of the chapter, Light, Shadows and Reflections talks about shadows and its characteristics with the help of suitable activities.
The section concludes by stating that shadows can only be obtained on a screen. The third section of the chapter, Light, Shadows and Reflections demonstrates the construction and working of a pinhole camera which is supplemented with associated images. The last section of the chapter, Light, Shadows and Reflections explains the concept of mirrors and reflections with the help of activities whose conclusion proves that light reflects a beam of light.

The chapter, Light, Shadows and Reflections covers the following topics -

  1. Transparent, Opaque and Translucent Objects
  2. What Exactly are Shadows?
  3. A Pinhole Camera
  4. Mirrors and Reflections

Page No 113:

Question 1:

Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Answer:

Opaque objects make shadows.



Page No 114:

Question 2:

Classify the objects or materials given below as opaque, transparent or translucent, luminous or non-luminous:

Air, water, piece of rock, sheet of aluminium, mirror, wooden board, sheet of polythene, CD, smoke, sheet of plane glass, fog, piece of red hot iron, umbrella, lighted florescent tube, wall, sheet of carbon paper, flame of a gas burner, sheet of cardboard, lighted torch, sheet of cellophane, wire mesh, kerosene stove, sun, firefly, moon.

Answer:

Object

Object is Transparent/Translucent/Opaque

Object is Luminous/Non-luminous

Air

Transparent

Non-luminous

Water

Transparent

Non-luminous

Piece of rock

Opaque

Non-luminous

Sheet of aluminium

Opaque

Non-luminous

Mirror

Opaque

Non-luminous

Wooden board

Opaque

Non-luminous

Sheet of polythene

Translucent

Non-luminous

CD

Translucent

Non-luminous

Smoke

Translucent

Non-luminous

Sheet of plane glass

Transparent

Non-luminous

Fog

Translucent

Non-luminous

Piece of red hot iron

Opaque

Luminous

Umbrella

Opaque

Non-luminous

Lighted fluorescent tube

Opaque

Luminous

Wall

Opaque

Non-luminous

Sheet of carbon paper

Opaque

Non-luminous

Flame of a gas burner

Translucent

Luminous

Sheet of cardboard

Opaque

Non-luminous

Lighted torch

Opaque

Luminous

Sheet of cellophane

Translucent

Non-luminous

Wire mesh

Translucent

Non-luminous

Kerosene stove

Opaque

Luminous

Sun

Opaque

Luminous

Firefly

Opaque

Luminous

Moon

Opaque

Non-luminous

Page No 114:

Question 3:

Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Answer:

When a cylinder is held in sunlight, then a circular shadow or a rectangular shadow can be obtained depending on its orientation related to the Sun.

When the top of the cylinder faces the Sun, then the shadow formed is circular. On the other hand, when the side of the cylinder faces the Sun, then the shadow formed is rectangular.

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Question 4:

In a completely dark room, if you hold up a mirror in front of you, will you see your reflection in the mirror?

Answer:

An image is formed due to reflection of light by a plane mirror. In a completely dark room, there is no light present in the room. Thus, no reflection of light takes place by the mirror placed in the room. Hence, no image will get formed by a mirror in a completely dark room.



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