Page 154 - Science Class 06
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directly through them. Glass, for example, is
transparent to all visible lights. The colour
of a transparent object depends on the
Fireflies and Glow-worms are woderful
colour of light it transmits. If green light
creatures. Firefly flashes green light from
passes through a transparent object, the
two spots on its body. Glow-worms are
emerging light is green; similarly if red light
wingless, female beetles which are
passes through a transparent object, the
luminous.
emerging light is red.
SOURCES OF LIGHT Use of Transparent Materials
The objects which emit light are called the Transparent materials, specially glass is
sources of light. We can classify sources of used for many purposes:
light into natural sources and ar ficial
v In making windowpanes and doors
sources.
v In spectacles
Natural sources of light : The sun and other
v In binoculars
stars are the natural sources of light.
v In making utensils
Ar ficial sources of light : It includes
candles, matches, electric lamps, torch, etc. Translucent Materials
Materials like frosted glass and some
plas cs are called translucent. When light
strikes translucent materials, only some of
the light passes through them. The light
does not pass directly through these
materials. It changes direc on many mes
and is sca ered as it passes through them.
Therefore, we cannot see clearly through
Natural Source of Light Ar ficial Source of Light
them; objects on the other side of a
translucent object appear fuzzy and unclear.
TRANSPARENT, TRANSLUCENT AND OPAQUE
MATERIALS Because translucent objects are semi-
transparent, some ultraviolet rays can go
There are many objects around us such as
water, milk, paper, wood, stone, glass, bu er through them. This is why a person behind a
paper, etc. But, when we bring these objects in translucent object can get a sunburn on a
the light, they behave differently. We can sunny day.
classify these materials into transparent, Uses of Translucent Materials
translucent and opaque.
Translucent materials are not widely used.
Transparent Materials
However, window and doors are made of
Materials like air, water and clear glass are translucent materials to allow only a small
called transparent. When light encounters amount of light to enter the room.
transparent materials, almost all of it passes
154 Science-6
