NCERT Solutions for Class 6 Science Chapter 11 – Light, Shadows And Reflections

Page No 113:

Question 1:

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


Opaque objects make shadows.

Page No 114:

Question 2:

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

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


ObjectObject is Transparent/Translucent/OpaqueObject is Luminous/Non-luminous
A piece of rockOpaqueNon-luminous
A sheet of aluminiumOpaqueNon-luminous
A mirrorOpaqueNon-luminous
A wooden boardOpaqueNon-luminous
A sheet of polytheneTranslucentNon-luminous
A CDTranslucentNon-luminous
A sheet of plane glassTransparentNon-luminous
A piece of red hot ironOpaqueLuminous
An umbrellaOpaqueNon-luminous
A lighted fluorescent tubeOpaqueLuminous
A wallOpaqueNon-luminous
A sheet of carbon paperOpaqueNon-luminous
The flame of a gas burnerTranslucentLuminous
A sheet of cardboardOpaqueNon-luminous
A lighted torchOpaqueLuminous
A sheet of cellophaneTranslucentNon-luminous
A wire meshTranslucentNon-luminous
Kerosene stoveOpaqueLuminous

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?


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?


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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